Based on a patch by Nikita Karetnikov <nikita@karetnikov.org>.
* guix-package.in (profile-regexp): New procedure.
(latest-profile-number): Remove `%profile-rx', and use
`profile-regexp' instead.
(profile-number, roll-back): New procedure.
(show-help): Add `--roll-back'.
(%options): Likewise.
(guix-package)[process-actions]: First check whether `roll-back?' is
among OPTS, and call `roll-back' if it is, followed by a recursive
call to `process-actions'. Emit the "nothing to be done" message only
when INSTALL or REMOVE is non-empty.
* tests/guix-package.sh (readlink_base): New function.
Add tests for `--roll-back'.
* doc/guix.texi (Invoking guix-package): Document `--roll-back'.
Reported by Andreas Enge.
* guix-package.in (%profile-directory): Honor $NIX_STATE_DIR.
(guix-package)[ensure-default-profile]: Use it.
[process-actions]: Call it when the `profile' option is
%CURRENT-PROFILE.
* tests/guix-package.sh: Add installation test with $HOME set, using the
default profile.
* doc/guix.texi: Set @documentlanguage.
(Installation): Add reference to `INSTALL' and `README'.
(Requirements): Mention store sharing with Nix.
(Defining Packages): Update example to include `use-modules' clauses
and to use (guix licenses).
* distro/packages/libsigsegv.scm (libsigsegv): Use just a single output,
otherwise nothing ends up in `out' as a consequence of commit a06a99f.
Reported by Andreas Enge <andreas@enge.fr>.
* guix-package.in (guix-package): Create the %USER-ENVIRONMENT-DIRECTORY
symlink if it doesn't exist yet.
* doc/guix.texi (Invoking guix-package): Document it.
* guix-package.in (guix-package)[process-query]: For `list-available',
show the outputs of each package.
* doc/guix.texi (Invoking guix-package): Update accordingly.
* 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.
* doc/guix.texi: New file.
* doc/fdl-1.3.texi: New file, copied from Gnulib.
* Makefile.am (info_TEXINFOS): New variable.
(EXTRA_DIST): Add `doc/fdl-1.3.texi'.
