gnu: plotutils: Allow compilation with newer libpng.

* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/patches/plotutils-libpng-jmpbuf.patch: New file.
* gnu/packages/plotutils.scm (plotutils): Add
  `plotutils-libpng-jmpbuf.patch' as an input, and apply it.

Merge branch 'core-updates'

gnu: gettext: Upgrade to 0.18.3.

* gnu/packages/gettext.scm (gettext): Upgrade to 0.18.3.
  Remove patch.  Change `patch-tests' phase to use (which "sh'); keep it
  regardless of whether we're cross compiling.

gnu: Add noweb.

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

gnu: Add GNU Rush.

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

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: 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.

Merge branch 'master' into core-updates

Conflicts:
	gnu/packages/make-bootstrap.scm

build: Split Makefile.am into two parts.

* Makefile.am (MODULES): Move gnu/* to gnu-system.am.
  (patchdir, dist_patch_DATA, bootstrapdir,
  bootstrap_x86_64_linuxdir, bootstrap_i686_linuxdir,
  dist_bootstrap_x86_64_linux_DATA, dist_bootstrap_i686_linux_DATA,
  nodist_bootstrap_x86_64_linux_DATA, nodist_bootstrap_i686_linux_DATA,
  install-data-hook, DISTCLEANFILES, DOWNLOAD_FILE,
  gnu/packages/bootstrap/x86_64-linux/guile-2.0.7.tar.xz,
  gnu/packages/bootstrap/i686-linux/guile-2.0.7.tar.xz): Move to...
* gnu-system.am: ... here.  New file.