Suggested by Taylan Ulrich Bayirli/Kammer and Ludovic Courtès.

* emacs/guix-base.el (guix-param-titles): Add output titles.
  (guix-messages): Add output messages.
  (guix-get-package-id-and-output-by-output-id): New procedure.
  (guix-define-buffer-type): Add ':buffer-name' key.
* emacs/guix-info.el: Add "output-info" buffer type.
  (guix-info-insert-methods): Add output methods.
  (guix-info-displayed-params): Add output params.
  (guix-output-info-insert-version, guix-output-info-insert-output): New
  procedures.
* emacs/guix-list.el: Add "output-list" buffer type.
  (guix-list-column-format): Add output formats.
  (guix-list-column-value-methods): Add output methods.
  (guix-package-list-type): New variable.
  (guix-generation-list-show-packages): Use it.
  (guix-package-list-marking-check): Use 'guix-output-list-mode'.
  (guix-list-mark-package-upgrades): New procedure.
  (guix-package-list-mark-upgrades): Use it.
  (guix-list-execute-package-actions): New procedure.
  (guix-package-list-execute): Use it.
  (guix-list-describe-maybe): New procedure.
  (guix-list-describe): Use it.
  (guix-output-list-mark-install, guix-output-list-mark-delete,
  guix-output-list-mark-upgrade, guix-output-list-mark-upgrades,
  guix-output-list-execute, guix-output-list-make-action,
  guix-output-list-describe): New procedures.
  (guix-output-list-describe-type): New variable.
* emacs/guix.el (guix-get-show-packages): Use 'guix-package-list-type'.
* doc/emacs.texi (emacs Commands): Mention 'guix-package-list-type'.
  (emacs List buffer): Adjust accordingly.
  (emacs Info buffer): Likewise.
  (emacs Buffer Names): New node.
  (emacs Keymaps): Add keymaps for output buffers.

* emacs/guix-main.scm: Rewrite in a functional way.  Add support for output
  entries.
  (%current-manifest, %current-manifest-entries-table,
  set-current-manifest-maybe!): Replace with...
  (manifest-entries->hash-table, manifest->hash-table): ... this.
  (manifest-entries-by-name+version): Replace with...
  (manifest-entries-by-name): ... this.
  (fold-manifest-entries): Rename to...
  (fold-manifest-by-name): ... this.
  (package-installed-param-alist): Rename to...
  (%manifest-entry-param-alist): ... this.
  (package-param-alist): Rename to...
  (%package-param-alist): this.
  (manifest-entry->installed-entry): Rename to...
  (manifest-entry->sexp): ... this.
  (manifest-entries->installed-entries): Rename to...
  (manifest-entries->sexps): ... this.
  (matching-generation-entries): Replace with...
  (matching-generations): ... this.
  (last-generation-entries): Replace with...
  (last-generations): ... this.
  (get-entries): Rename to...
  (entries): ... this.
  (installed-entries-by-name+version, installed-entries-by-package,
  matching-package-entries, fold-object, package-entries-by-name+version,
  package-entries-by-spec, package-entries-by-regexp, package-entries-by-ids,
  newest-available-package-entries, all-available-package-entries,
  manifest-package-entries, installed-package-entries,
  generation-package-entries, obsolete-package-entries,
  all-generation-entries, generation-entries-by-ids, profile-generations,
  %package-entries-functions, %generation-entries-functions): Remove.
  (manifest=?, manifest-entry->name+version+output, manifest-entry-by-output,
  list-maybe, matching-packages, filter-packages-by-output, packages-by-name,
  manifest-entry->packages, all-available-packages, newest-available-packages,
  specification->package-pattern, specification->output-pattern,
  id->package-pattern, id->output-pattern, specifications->package-patterns,
  specifications->output-patterns, ids->package-patterns,
  ids->output-patterns, manifest-patterns-result, obsolete-package-patterns,
  obsolete-output-patterns, manifest-package-patterns,
  manifest-output-patterns, obsolete-package-sexp,
  package-pattern-transformer, output-pattern-transformer, entry-type-error,
  search-type-error, pattern-transformer, patterns-maker,
  package/output-sexps, find-generations, generation-sexps): New procedures.
  (%pattern-transformers, %patterns-makers): New variables.
* emacs/guix-base.el (guix-continue-package-operation-p): Adjust accordingly.
* emacs/guix-info.el (guix-package-info-insert-action-button): Likewise.

* emacs/guix-base.el: Add and use general functions instead of
  specialized functions generated by 'guix-define-buffer-type' macro.
  (guix-buffer-type, guix-entry-type): New variables.
  (guix-set-vars): Add new variables.
  (guix-get-show-entries, guix-show-entries, guix-set-buffer)
  (guix-history-call, guix-make-history-item)
  (guix-get-params-for-receiving, guix-revert-buffer)
  (guix-redisplay-buffer): New functions.
  (guix-define-buffer-type): Do not generate specialized functions.
* emacs/guix-info.el (guix-package-info-insert-full-names): Use
  'guix-get-show-entries'.
  (guix-generation-info-insert-number): Likewise.
* emacs/guix-list.el (guix-list-describe): New function.
  (guix-list-define-entry-type): Do not generate specialized one.
  (guix-generation-list-show-packages): Use 'guix-get-show-entries'.
* emacs/guix.el (guix-show-generations-function): Remove.
  (guix-get-show-packages): Use new functions.
  (guix-get-show-generations): Likewise.

* gnu/packages.scm (%package-module-path): Honor $GUIX_PACKAGE_PATH.
* test-env.in: Unset 'GUIX_PACKAGE_PATH'.
* tests/guix-package.sh: Test it.
* doc/guix.texi (Package Modules): Document it.

* guix/scripts/build.scm (show-build-options-help): Document -L.
  (%standard-build-options): Add -L/--load-path.
* tests/guix-package.sh: Test it.

* gnu/packages.scm (%package-module-path): New variable.
  (all-package-modules): New procedure.
  (fold-packages): Use it instead of 'package-modules'.

* gnu/packages.scm (%distro-root-directory): New variable.
  (%distro-module-directory): Remove.
  (package-files): Rename to...
  (scheme-files): ... this.  Return absolute file names, not stripped.
  (file-name->module-name): New procedure.
  (package-modules): Add 'directory' and 'sub-directory' parameters.
  Rewrite accordingly.
  (fold-packages): Adjust 'package-modules' call accordingly.

* gnu/packages/maths.scm (maxima): Update to 5.34.1 which fixes a bug in
  the plotting capabilities present in the previous version.  Add Gnuplot
  and Tcl/Tk to 'inputs'.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

* gnu/packages/abiword.scm, gnu/packages/admin.scm, gnu/packages/aidc.scm,
  gnu/packages/backup.scm, gnu/packages/bittorrent.scm,
  gnu/packages/boost.scm, gnu/packages/compression.scm,
  gnu/packages/cryptsetup.scm, gnu/packages/curl.scm,
  gnu/packages/cyrus-sasl.scm, gnu/packages/dc.scm, gnu/packages/emacs.scm,
  gnu/packages/fonts.scm, gnu/packages/fontutils.scm, gnu/packages/geeqie.scm,
  gnu/packages/ghostscript.scm, gnu/packages/gimp.scm,
  gnu/packages/gkrellm.scm, gnu/packages/gl.scm, gnu/packages/glib.scm,
  gnu/packages/gnome.scm, gnu/packages/gnunet.scm, gnu/packages/gnupg.scm,
  gnu/packages/gnutls.scm, gnu/packages/gnuzilla.scm, gnu/packages/gsasl.scm,
  gnu/packages/gtk.scm, gnu/packages/gv.scm, gnu/packages/image.scm,
  gnu/packages/indent.scm, gnu/packages/inkscape.scm,
  gnu/packages/lesstif.scm, gnu/packages/links.scm, gnu/packages/lisp.scm,
  gnu/packages/lsh.scm, gnu/packages/lsof.scm, gnu/packages/maths.scm,
  gnu/packages/mp3.scm, gnu/packages/openssl.scm, gnu/packages/ots.scm,
  gnu/packages/pciutils.scm, gnu/packages/pcre.scm, gnu/packages/pdf.scm,
  gnu/packages/pulseaudio.scm, gnu/packages/python.scm, gnu/packages/slim.scm,
  gnu/packages/ssh.scm, gnu/packages/texlive.scm, gnu/packages/vim.scm,
  gnu/packages/vpn.scm, gnu/packages/web.scm, gnu/packages/wv.scm,
  gnu/packages/xiph.scm, gnu/packages/xml.scm, gnu/packages/xorg.scm,
  gnu/packages/yasm.scm, gnu/packages/zip.scm,
  guix/build/cmake-build-system.scm, guix/build/perl-build-system.scm,
  guix/build/python-build-system.scm, guix/download.scm: Replaces uses of
  #:renamer and 'symbol-prefix-proc' with #:prefix.

* gnu/packages/gtk.scm (gtk+): Disable tests on mips64el-linux.

Reported by Mark H. Weaver.

* gnu/packages/gtk.scm (gtk+)[native-inputs]: Remove XORG-SERVER on
  mips64el-linux.

* gnu/services/networking.scm (bitlbee-service): New procedure.
* doc/guix.texi (Networking Services): Document it.

* gnu/packages/patches/xf86-input-synaptics-glibc-2.20.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/xorg.scm (xf86-input-synaptics): Use it.  Improve
  synopsis and description.

* gnu/packages/node.scm (node)[native-inputs]: Add WHICH.

* gnu/packages/xorg.scm (xf86-input-vmmouse): Remove.  This driver
  implement the mouse protocol of a proprietary emulator.
* gnu/services/xorg.scm (xorg-start-command): Remove reference.

* gnu/packages/linux.scm (linux-libre)[inputs]: New field.

* gnu/system.scm (%base-packages): Add PATCH.

This fixes regressions introduced in de1c158f ("system: Add support for
boot-time mapped devices.").

* doc/guix.texi (Initial RAM Disk): Adjust example with custom use of
  'base-initrd'.  Document #:mapped-devices parameter of 'base-initrd'.
* gnu/system/vm.scm (system-disk-image, system-qemu-image,
  virtualized-operating-system): Adjust call to 'base-initrd' to new
  signature.

* guix/build/syscalls.scm (%interface-line): Remove whitespace in rest
  pattern.  (There's no extra whitespace after the colon with Linux
  2.6.32.)

Fixes <http://bugs.gnu.org/18526>.
Reported by Mark H. Weaver.

* guix/build/download.scm (tls-wrap): Add 'server' parameter.  Call
  'set-session-server-name!' when (gnutls) defines it.
  (open-connection-for-uri): Adjust 'tls-wrap' call accordingly.

Fixes <http://bugs.gnu.org/18262>.

* gnu/packages/tcl.scm (perl-tk)[arguments]: Add #:parallel-build? #f.

* guix/scripts/package.scm (guix-package)[process-actions]: Use
  'profile-generations' instead of the equivalent code.

* guix/profiles.scm (profile-generations): New procedure.

* gnu/build/linux-boot.scm (boot-system): Add #:pre-mount parameter and
  honor it.
* gnu/system/linux-initrd.scm (base-initrd): Add #:mapped-devices
  parameter.  Add 'device-mapping-commands' variable, and use it to
  build the #:pre-mount argument of 'boot-system'.
* gnu/system.scm (mapped-device-user,
  operating-system-user-mapped-devices,
  operating-system-boot-mapped-devices): New procedures.
  (device-mapping-services): Use 'operating-system-user-mapped-devices'
  instead of 'operating-system-mapped-devices'.
  (operating-system-initrd-file): Call the initrd with #:mapped-devices.

* gnu/build/activation.scm (modify-user, ensure-user): New procedures.
  (activate-users+groups): Systematically call 'ensure-user'.

* gnu/packages/valgrind.scm (valgrind): Update to 3.10.0.
* gnu/packages/patches/valgrind-glibc.patch: Remove.
* gnu-system.am (dist_patch_DATA): Adjust accordingly.

* gnu/packages/backup.scm (duplicity)[native-inputs]: Add util-linux.

* gnu/packages/ots.scm (ots)[arguments]: New field.

Suggested by Federico Beffa <beffa@ieee.org>.

* gnu/packages/libcanberra.scm (sound-theme-freedesktop): New variable.

* gnu/packages/libcanberra.scm (libcanberra): Add PulseAudio and eudev
  as inputs.

Suggested by Federico Beffa <beffa@ieee.org>.

* gnu/packages/emacs.scm (emacs): Switch to GTK+ 3.

* gnu/packages/cyrus-sasl.scm (cyrus-sasl)[arguments]: Pass
  #:parallel-build?.

* guix/scripts/offload.scm (machine-less-loaded?, machine-faster?):
  Remove.
  (machine-power-factor): New procedure.
  (machine-less-loaded-or-faster?): Use it.

* guix/scripts/offload.scm (choose-build-machine): When BEST is
  overloaded, try the other machines.

* gnu/build/file-systems.scm (check-file-system): Pass '-C 0' to FSCK.
  Suggested by Mark H. Weaver.

* gnu/packages/guile.scm (guile-charting): Update to 0.2.0.  Remove
  now-unnecessary cruft from 'snippet'.  Modify 'godir' in Makefile.in.

* gnu/services/base.scm (udev-service): Append "/lib/udev/rules.d" to
  EUDEV_RULES_DIRECTORY.

* gnu/packages/cdrom.scm (cdparanoia): Double space in description.
* gnu/packages/maths.scm (hdf5): Double space in synopsis.

* gnu/packages/linux.scm (linux-libre): Update to version 3.16.3.