Merge branch 'master' into core-updates

Conflicts:
	gnu/packages/commencement.scm
	gnu/packages/xml.scm

doc: Move most 'HACKING' informations into the manual.

* 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.

Merge branch 'master' into core-updates

build: Bump version number.

* configure.ac: Change version to 0.8.3.

build: Build and install manual pages.

* configure.ac: Use 'AM_MISSING_PROG' for 'help2man'.
* doc.am (subcommand-manual-target, SUBCOMMANDS, dist_man1_MANS): New
  variables.
  (doc/guix-$(1).1, doc/guix.1): New targets.

Merge branch 'master' into gtk-rebuild

Conflicts:
	gnu/packages/gtk.scm

build: Require Guile >= 2.0.7.

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

Merge branch 'master' into core-updates

Conflicts:
	gnu-system.am
	gnu/packages/gstreamer.scm

build: Silence warnings about 'make' portability.

* configure.ac: Pass -Wno-portability to AM_INIT_AUTOMAKE.

Merge branch 'master' into core-updates

Add Bash completion file.

* etc/completion/bash/guix: New file.
* Makefile.am (dist_bashcompletion_DATA): New variable.
* configure.ac: Add --with-bash-completion-dir.

Merge branch 'master' into core-updates

build: Enable silent rules by default.

* configure.ac: Use 'AM_SILENT_RULES'.

Merge branch 'master' into core-updates

build: Detect lack of guile.m4 at autoconf time.

* configure.ac: Add 'm4_pattern_forbid' invocation.

Merge branch 'master' into core-updates

build: Bump version number.

* configure.ac: Change to version 0.8.2.

build: Reject or warn against file name length limit overruns.

* m4/guix.m4 (GUIX_TEST_ROOT_DIRECTORY, LINUX_HASH_BANG_LIMIT,
  SOCKET_FILE_NAME_LIMIT, GUIX_SOCKET_FILE_NAME_LENGTH,
  GUIX_TEST_SOCKET_FILE_NAME_LENGTH, GUIX_HASH_BANG_LENGTH,
  GUIX_CHECK_FILE_NAME_LIMITS): New macros.
* configure.ac: Use 'GUIX_CHECK_FILE_NAME_LIMITS'.
* config-daemon.ac: Use 'GUIX_TEST_ROOT_DIRECTORY'.
* test-env.in: Check socket name length and emit warning if it exceeds
  107.

build: Change version to 0.8.1.

* configure.ac: Change version to 0.8.1.

Merge branch 'master' into 'core-updates'.