* guix/gnupg.scm (%gpg-command): Turn into a SRFI-39 parameter.
  (%openpgp-key-server): Likewise.  Default to pgp.mit.edu, as
  keys.gnupg.net is unreliable.
  Update users.

* gnu/packages/scheme.scm (chicken): New variable.

* guix/ui.scm (show-guix-usage): Mention `guix --help'.
  Suggested by Mark H. Weaver.
  (run-guix-command): Invoke it when a command is not found.
  (guix-main): Adjust accordingly.

* guix/scripts/package.scm (guix-package)[process-actions](package->tuple):
  Put the output path in the tuple, not the derivation path.
* tests/guix-package.sh: Add test.

Before this, something like "guix package -i glibc" could fail because
glibc lists linux-libre-headers as a propagated input (which would be
added as a dependency in the manifest) but the linux-libre-headers
output could be unavailable, leading to an error like this:

  path `/nix/store/4v2bk8sx5cm166gks3fi3q7d9zchibnk-linux-libre-headers-3.3.8' is not valid

This patch adds such dependencies as inputs of the profile derivation.

* guix/scripts/package.scm (profile-derivation): Accept package objects
  in the `deps' field of an element of PACKAGES.  Convert them to their
  output path for BUILDER, and add them to the inputs of the
  `build-expression->derivation' call.
  (input->name+path): When INPUT doesn't contain a package object,
  return it as is.
  (guix-package)[process-actions](canonicalize-deps): Expect DEPS to
  contain package objects, and leave them as is.

* guix/scripts/refresh.scm (guix-refresh): When updating a source file,
  gracefully handle the case where TARBALL is #f.
  Reported by Nikita Karetnikov <nikita@karetnikov.org>.

* guix/ui.scm (command-files, commands, show-guix-help): New procedures.
  (guix-main): Invoke `show-guix-help' when passed `--help'.

* guix/ui.scm (run-guix-command): Can `resolve-interface' errors and
  report them with `leave'.  Parameterize `program-name' from here.
  (guix-main): Remove parameterization of `program-name'.

* guix/gnu-maintenance.scm (ftp-server/directory)[quirks]: Add GnuTLS.

This would manifest when downloading a large file such as the Bazaar
tarball, leading to an "Error in the pull function" GnuTLS exception.

* guix/build/download.scm (add-weak-reference): New procedure.
  (tls-wrap): Add (add-weak-reference record port).

* guix/scripts/package.scm (search-path-environment-variables): Prefer
  %USER-ENVIRONMENT-DIRECTORY when it points to PROFILE.
  (display-search-paths): Use 3 spaces for indentation.

* m4/guix.m4 (GUIX_ASSERT_GUILE_FEATURES): New macro.
* configure.ac: Use it.

* gnu/packages/emacs.scm (geiser): Update to 0.4.

* gnu/packages/bazaar.scm: New file.
* Makefile.am (MODULES): Add it.

* guix/build-system/python.scm, guix/build/python-build-system.scm: New files.
* Makefile.am (MODULES): Add them.

* guix/build/rpath.scm: New file.
* Makefile.am (MODULES): Add it.
* gnu/packages/python.scm (python): Use it; remove local copy of
  the *rpath* procedures.
* gnu/packages/samba.scm (samba): Likewise.

* gnu/packages/base.scm (tzdata): New variable.

* gnu/packages/cryptsetup.scm: New file.
* Makefile.am (MODULES): Add it.

* gnu/packages/lvm.scm: New file.
* Makefile.am (MODULES): Add it.

* NEWS: Update.

* doc/guix.texi (Defining Packages): Add cross-reference to "Invoking
  guix refresh".
  (Invoking guix refresh): New node.

* guix/scripts/package.scm (guix-package)[show-what-to-remove/install]:
  Display the output name.

* guix/scripts/package.scm (guix-package)[find-package]: Add optional
  parameter `output'.  Use it.
  [process-actions]: When computing UPGRADE, pass OUTPUT to
  `find-package'.

* gnu/packages/python.scm (python): Add `--enable-shared'.  Add
  #:modules and #:phases.  Add PatchELF as an input.

* gnu/packages/gsasl.scm (gsasl): Move GnuTLS to `propagated-inputs'.

* gnu/packages/hugs.scm: New file.
* Makefile.am (MODULES): Add it.

* guix/ui.scm (show-what-to-build): Capitalize user messages, as per the
  GCS (info "(standards) Errors").

* guix/scripts/package.scm (guix-package)[process-actions]: Fix spacing.

* gnu/packages/help2man.scm (help2man): Update to 1.41.2.

* gnu/packages/guile.scm (guile-ncurses): Update to 1.4.

* gnu/packages/freeipmi.scm: New file.
* Makefile.am (MODULES): Add it.

* gnu/packages/ghostscript.scm (ghostscript): Remove libxext and libxt
  as inputs.
  (gv): Move to...
* gnu/packages/gv.scm (gv): ... here.  New file.
  (ghostscript/x): Variant of GHOSTSCRIPT with libxt and libxext as
  inputs.

* gnu/packages/fontutils.scm (freetype): Use mirror://savannah URL.

* guix/scripts/refresh.scm (%options): Change `--dry-run' to `--update'.
  (show-help): Adjust accordingly.
  (guix-refresh): Likewise.

* gnu/packages/ghostscript.scm (gv): New variable.

* gnu/packages/ghostscript.scm (ghostscript): Add X related inputs.

* gnu/packages/xorg.scm (libxaw3d): New variable.

* gnu/packages/gtk.scm: New module.
* Makefile.am (MODULES): Add it.