* HACKING (Contributing): New section.
  (Building from Git, The Perfect Setup, Coding Style, Submitting Patches):
  Move to ...
* doc/guix.texi (Running Guix Before It Is Installed): Likewise.
* doc/contributing.texi: ... here. New file.
* doc.am (EXTRA_DIST): Use it.
* README (Installation): Adapt to it.
* configure.ac (DOT): Likewise.

* README (Installing Guix from Guix): Replace complicated instructions with
  'guix environment guix'.

* README (Requirements): Add GNU Make.
* doc/guix.texi (Requirements): Likewise.

* configure.ac: Require guile-2.0 >= 2.0.7.
* README: Adjust accordingly.
* doc/guix.texi (Requirements): Likewise.

* README (Requirements): add a note about 'guix download''s GnuTLS dependency.
* doc/guix.texi (Requirements): Likewise.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>

* README (Requirements): Add Guile-JSON.
* doc/guix.texi (Requirements): Likewise.

* README: Make 'guix package' command line more readable.  Mention
  --localstatedir.

    * README update anachronistic reference to /nix/store

* README (Installing Guix from Guix): Use "gcc-toolchain" instead of
  "gcc,binutils,ld-wrapper,glibc".

Reported by Mark H. Weaver <mhw@netris.org>.

* README (Installing Guix from Guix): Explicitly mention $PATH
  separately.  Mention $ACLOCAL_PATH, not $ACLOCAL.  Give the exact
  command to install the dependencies.  Remove mention of
  $GUIX_LD_WRAPPER_ALLOW_IMPURITIES, which is no longer needed.

* README (Requirements): Remove Nixpkgs.  Remove mentions of building
  from Git.
  (Installation): Refer to the manual.
* HACKING: List requirements for when building from Git.
  Remove the `dot: Command not found' error.

* doc/guix.texi (Requirements): Require Guile 2.0.5+.
* README: Ditto.

* README (Requirements): Replace "autoreconf" by "bootstrap".
  (Installing Guix from Guix): Augment and update.

* README (Installing Guix from Guix): New section.
  Suggested by Alex Sassmannshausen <alex.sassmannshausen@gmail.com>.

* daemon.am (libexec_PROGRAMS, nix_setuid_helper_SOURCES,
  nix_setuid_helper_CPPFLAGS, nix_setuid_helper_LDADD): New variables.
* test-env.in: Set and export `NIX_SETUID_HELPER'.
* README (Installing Guix as non-root): New section.

* README (Hacking): Rename to...
  (Requirements): ... this.  Add the daemon's dependencies.

* README: Mention pronunciation of "Guix".
* doc/guix.texi (Introduction): Likewise.

* README: Update introductory summary.  Point to Savannah instead of
  Gitorious.  Mention <bug-guix@gnu.org>.
  (Guix & Nix): New section.

* README (Related software): New section.

* configure.ac: Change package name to "GNU Guix", and bug-report
  address to `gnu-system-discuss@gnu.org'.
* doc/guix.texi: Replace "Guix" by "GNU Guix" in some places.
  (Top, Introduction): Mention "for the GNU system".
* HACKING, README: Use "GNU Guix" instead of "Guix" in some places.

* guix/utils.scm (sha256): Remove Coreutils- and libchop-based
  implementations.
* README: Update accordingly.

* m4/guix.m4: New file.
* configure.ac: Use `GUIX_ASSERT_LIBGCRYPT_USABLE'.  Set and substitute
  `LIBGCRYPT_PREFIX'.
* Makefile.am (AM_DISTCHECK_CONFIGURE_FLAGS): Pass
  `--with-libgcrypt-prefix=$(LIBGCRYPT_PREFIX)'.

* configure.ac: Always show the result of checking for Nixpkgs.  Don't
  warn when Nixpkgs is not found.
* Makefile.am (AM_DISTCHECK_CONFIGURE_FLAGS): Remove `--with-nixpkgs'
  flag.
* guix/utils.scm (%nixpkgs-directory): Use either the compile-time or
  the run-time `NIXPKGS' environment variable.
* release.nix (jobs.tarball, jobs.build): Remove `--with-nixpkgs'
  configure flag.
* README: Mark Nixpkgs as optional.

* distro/packages/databases.scm, distro/packages/guile.scm,
  distro/packages/typesetting.scm: Change uses of `nixpkgs-derivation*'
  to `nixpkgs-derivation', to avoid failing at compile-time.

* README (Hacking): Mention `--with-nixpkgs'.  List the autotools and
  Gettext, as suggested by Nikita Karetnikov <nikita.karetnikov@gmail.com>.

* README: Require libgcrypt or libchop.