Import (guix hash) in build-aux/download.scm.

* build-aux/download.scm: Import (guix hash).
  Reported by Matthew Lien <bluet@bluet.org>.

gnu: Add noweb.

* gnu/packages/noweb.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

gnu: qemu: Upgrade to 1.5.1.

* gnu/packages/qemu.scm (qemu-kvm): Add `--cc' configure option.
  Add PIXMAN and ALSA-LIB as inputs.
  (qemu): Upgrade to 1.5.1  Remove autotool hack for pixman.  Patch
  tests/libqtest.c.  Remove Autoconf, Automake, and Libtool from the
  inputs.  Fix `home-page'.

Update `NEWS' and `TODO'.

Use `port-sha256' and `open-sha256-port'.

* guix/derivations.scm (derivation-hash): Add comment as to why we keep
  the plain `sha256' call.
* guix/scripts/download.scm (guix-download): Use `port-sha256' instead
  of (compose sha256 get-bytevector-all).
* guix/scripts/refresh.scm (update-package): Likewise.

hash: Add `open-sha256-port'.

* guix/hash.scm (GCRY_MD_SHA256): New macro.
  (sha256): Use it.
  (open-sha256-md, md-write, md-read, md-close, open-sha256-port,
  port-sha256): New procedures.
* tests/hash.scm: New file.
* Makefile.am (SCM_TESTS): Add it.

Move `sha256' to (guix hash).

* guix/utils.scm (sha256): Move to...
* guix/hash.scm: ... here.  New file.
* Makefile.am (MODULES): Add it.
* guix/derivations.scm, guix/scripts/download.scm,
  guix/scripts/hash.scm, guix/scripts/refresh.scm, tests/base32.scm,
  tests/derivations.scm, tests/store.scm: Use (guix hash).

gnu: liboop: Fix & improve meta-data.

* gnu/packages/lsh.scm (liboop): Fix home page.  Improve `synopsis' and
  `description'.  Thanks to carl hansen <carlhansen1234@gmail.com>, who
  raised it on bug-gsrc@gnu.org.

ui: Don't make substituter-related RPCs at all when substitutes are disabled.

Reported by Nikita Karetnikov and Cyril Roelandt.

* guix/ui.scm (show-what-to-build): Call `substitutable-path-info'
  only when USE-SUBSTITUTES? is true.

gnu: Add GNU vc-dwim.

* gnu/packages/version-control.scm (vc-dwim): New variable.

gnu: Add GNU Rush.

* gnu/packages/rush.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

substitute-binary: Avoid dangling connections to the server.

* guix/web.scm (open-socket-for-uri): New procedure.
  (http-fetch): Add `port' keyword parameter; use it.
* guix/scripts/substitute-binary.scm (%random-state): New variable.
  (with-timeout): Wait a little before retrying.
  (fetch): Use `open-socket-for-uri', and keep a copy of the socket in
  variable `port'.  Close PORT upon timeout.

gnutls: fix the test-suite for 32 bits systems.

* gnu/packages/patches/gnutls-fix-tests-on-32-bits-system.patch: New file.
* gnu-system.am: Add it here...
* gnu/packages/gnutls.scm (gnutls): ... and use it here.

Thanks to Nikos Mavrogiannopoulos for providing this patch:
http://permalink.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/6778

gnu: lout: Upgrade to 3.40.

* gnu/packages/lout.scm (lout): Upgrade to 3.40.

download: Add Savannah's master site.

* guix/download.scm (%mirrors): Add the "-noredirect" version of
  Savannah.

gnu: lsh: Upgrade to 2.1.

* gnu/packages/lsh.scm (lsh): Upgrade to 2.1.  Add Nettle as an input.
  Remove now unneeded patches.
* gnu/packages/patches/lsh-guile-compat.patch,
  gnu/packages/patches/lsh-no-root-login.patch,
  gnu/packages/patches/lsh-pam-service-name.patch: Remove.
* gnu-system.am (dist_patch_DATA): Remove them.

gnu: bigloo: Explicitly link libbigloopthread against libgc.

* gnu/packages/scheme.scm (bigloo): In `configure' phase, change
  api/thread/src/Makefile to explicitly link against libgc.

gnu: Add gdk-pixbuf.

* gnu/packages/gtk.scm (gdk-pixbuf): New variable.

gnu: ed: Upgrade to 1.9.

* gnu/packages/ed.scm (ed): Upgrade to 1.9.

gnu: gcc-4.8: Upgrade to 4.8.1.

* gnu/packages/gcc.scm (gcc-4.8): Upgrade to 4.8.1.