* 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'.