tests: Add `guix hash' test.

* guix/scripts/hash.scm (guix-hash)[eof->null]: New procedure.
  Use it to convert the EOF object to the empty bytevector.
* tests/guix-hash.sh: New file.
* Makefile.am (SH_TESTS): Add it.

gnu: Add GNU Bazaar.

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

Add 'python-build-system'.

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

Add (guix build rpath).

* 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: Add cryptsetup.

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

gnu: Add lvm2.

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

gnu: Add Hugs.

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

gnu: Add GNU FreeIPMI.

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

gnu: gv: Move to a separate file.

* 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: Add atk.

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

Merge branch 'core-updates'

build: Add silent-rules machinery for `guild compile'.

* Makefile.am (AM_V_GUILEC, AM_V_GUILEC_, AM_V_GUILEC_0): New
  variables.
  (.scm.go): Use $(AM_V_GUILEC).

build: Replace *.log in `CLEANFILES' by the exact list of files.

* Makefile.am (SCM_TESTS, SH_TESTS): New variables.
  (TESTS): Use them.
  (CLEANFILES): Replace *.log by $(SCM_TESTS:%.scm=%.log).

Merge branch 'master' into core-updates

Conflicts:
	Makefile.am
	gnu/packages/autotools.scm
	gnu/packages/guile.scm
	gnu/packages/python.scm
	gnu/packages/shishi.scm
	guix/gnu-maintenance.scm
	guix/scripts/build.scm
	guix/scripts/gc.scm
	guix/scripts/package.scm
	guix/scripts/substitute-binary.scm
	guix/ui.scm
	nix/nix-daemon/guix-daemon.cc
	test-env.in
	tests/nar.scm
	tests/store.scm

web: Factorize `http-get' hackery.

This should fix `substitute-binary --query' on Guile 2.0.5.

* guix/web.scm: New file.
* Makefile.am (MODULES): Add it.
* po/POTFILES.in: Add it.
* guix/gnu-maintenance.scm (http-fetch): Remove.
  (%package-list-url): Turn into a URI.
  (official-gnu-packages): Add #:text? #t to `http-fetch' call.
* guix/scripts/substitute-binary.scm (fetch): Remove `http' case, and
  use `http-fetch' instead.

Add `guix refresh' and related auto-update tools.

* guix/gnu-maintenance.scm (ftp-server/directory)[quirks]: Add glib.
  (package-update-path, download-tarball, package-update,
  update-package-source): New procedures.
* guix/gnupg.scm, guix/scripts/refresh.scm: New files.
* Makefile.am (MODULES): Add them.
* guix/utils.scm (file-extension): New procedure.

Add 'guix hash'.

* guix/scripts/hash.scm: New file.
* Makefile.am (MODULES): Add it.
* po/POTFILES.in: Add it.
* doc/guix.texi (Invoking guix hash): New node.
  (Defining Packages): Add a cross-reference to the 'Invoking guix
  hash' node.

build: Add `sync-synopses.scm'.

* build-aux/sync-synopses.scm: New file.
* Makefile.am (EXTRA_DIST): Add it.
  (dist-hook): New target.

gnu: Python: bump to version 2.7.4.

* gnu/packages/python.scm: bump to version 2.7.4, remove references to
python-fix-dbm.patch.
* Makefile.am: remove references to python-fix-dbm.patch
* gnu/packages/patches/python-fix-dbm.patch: remove it.

gnu: Add Ratpoison.

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