build: Build guix/scripts/download.go after guix/build/download.go.

* Makefile.am (guix/scripts/download.go): Add dependency on
  `guix/build/download.go'.
  Reported by Nikita Karetnikov <nikita@karetnikov.org>.

Replace individual scripts with master 'guix' script.

* scripts/guix.in: New script.

* Makefile.am (bin_SCRIPTS): Add 'scripts/guix'.  Remove 'guix-build',
  'guix-download', 'guix-import', 'guix-package', and 'guix-gc'.

  (MODULES): Add 'guix/scripts/build.scm', 'guix/scripts/download.scm',
  'guix/scripts/import.scm', 'guix/scripts/package.scm', and
  'guix/scripts/gc.scm'.

* configure.ac (AC_CONFIG_FILES): Add 'scripts/guix'.  Remove 'guix-build',
  'guix-download', 'guix-import', 'guix-package', and 'guix-gc'.

* guix-build.in, guix-download.in, guix-gc.in, guix-import.in,
  guix-package.in: Remove shell script boilerplate.  Move to guix-COMMAND.in
  to guix/scripts/COMMAND.scm.  Rename module from (guix-COMMAND) to
  (guix scripts COMMAND).  Change "guix-COMMAND" to "guix COMMAND" in
  usage help string.

* pre-inst-env.in: Add "@abs_top_builddir@/scripts" to the front of $PATH.
  Export $GUIX_UNINSTALLED.

* tests/guix-build.sh, tests/guix-daemon.sh, tests/guix-download.sh,
  tests/guix-gc.sh, tests/guix-package.sh: Use "guix COMMAND" instead of
  "guix-COMMAND".

* doc/guix.texi: Replace all occurrences of "guix-COMMAND" with
  "guix COMMAND".

* po/POTFILES.in: Update.

Add (gnu system vm).

* gnu/system/vm.scm: New file.
* Makefile.am (MODULES): Add it.

gnu: Add support for Guile in Linux initrd.

* gnu/packages/linux-initrd.scm: New file.

gnu: qemu-kvm: Add patch to have multiple SMB shares.

* gnu/packages/qemu.scm (qemu-kvm/smb-shares): New variable.
* gnu/packages/patches/qemu-multiple-smb-shares.patch: New file.
* Makefile.am (dist_patch_DATA): Add it.

gnu: Add GNU Parted.

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

gnu: guile-static: Add bindings for low-level Linux syscalls.

* gnu/packages/make-bootstrap.scm (%guile-static): Add
  `guile-linux-syscalls.patch' as an input, and use it.
* gnu/packages/patches/guile-linux-syscalls.patch: New file.
* Makefile.am (dist_patch_DATA): Add it.

gnu: Add vim.

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

gnu: Add missing patch for mcron.

* gnu/packages/patches/mcron-install.patch: New file.
* Makefile.am (dist_patch_DATA): Add it.

gnu: Add GNU Wdiff.

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

Add pre-inst-env and test-env to nodist_noinst_SCRIPTS in Makefile.am.

* Makefile.am: Add nodist_noinst_SCRIPTS = pre-inst-env test-env.

gnu: Add Samba and iniparser.

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

gnu: Rename module 'freetype' to the more general 'fontutils'.

* gnu/packages/freetype.scm: Rename file to...
* gnu/packages/fontutils.scm: ...this.
* Makefile.am (MODULES): Rename module.
* gnu/packages/{ghostscript,grub,pdf,texlive}.scm: Rename dependency.

gnu: Add popt.

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

gnu: Add libunwind.

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

gnu: Add tmux.  licenses: add ISC.

* gnu/packages/tmux.scm: New file.
* Makefile.am (MODULES): Use it.
* guix/licenses.scm: add ISC.

gnu: Add tcsh.

* gnu/packages/tcsh.scm: New file.
* gnu/packages/patches/tcsh-fix-autotest.patch: New file
* Makefile.am: Add them.

gnu: Add GNU GRUB.

* gnu/packages/grub.scm,
  gnu/packages/patches/grub-gets-undeclared.patch: New files.
* Makefile.am (MODULES): Add grub.scm.
  (dist_patch_DATA): Add grub-gets-undeclared.patch.

gnu: Add libcddb, GNU libcdio, and GNU xorriso.

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

gnu: Add QEMU-KVM.

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