gnu: Split (gnu packages base), adding (gnu packages commencement).

* gnu/packages/base.scm (gnu-make-boot0, diffutils-boot0,
  findutils-boot0, %boot0-inputs, nix-system->gnu-triplet, boot-triplet,
  binutils-boot0, gcc-boot0, perl-boot0, linux-libre-headers-boot0,
  texinfo-boot0, %boot1-inputs, glibc-final-with-bootstrap-bash,
  cross-gcc-wrapper, static-bash-for-glibc, glibc-final,
  gcc-boot0-wrapped, %boot2-inputs, binutils-final, libstdc++,
  gcc-final, ld-wrapper-boot3, %boot3-inputs, bash-final, %boot4-inputs,
  guile-final, gnu-make-final, ld-wrapper, coreutils-final, grep-final,
  %boot5-inputs, %final-inputs, canonical-package, gcc-toolchain,
  gcc-toolchain-4.8, gcc-toolchain-4.9): Move to...
* gnu/packages/commencement.scm: ... here.  New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* build-aux/check-final-inputs-self-contained.scm: Adjust accordingly.
* gnu/packages/cross-base.scm: Likewise.
* gnu/packages/make-bootstrap.scm: Likewise.
* guix/build-system/cmake.scm (cmake-build): Likewise.
* guix/build-system/gnu.scm (standard-packages, gnu-build,
  gnu-cross-build): Likewise.
* guix/build-system/perl.scm (perl-build): Likewise.
* guix/build-system/python.scm (python-build): Likewise.
* guix/build-system/trivial.scm (guile-for-build): Likewise.
* guix/download.scm (url-fetch): Likewise.
* guix/gexp.scm (default-guile): Likewise.
* guix/git-download.scm (git-fetch): Likewise.
* guix/monads.scm (run-with-store): Likewise.
* guix/packages.scm (default-guile): Likewise.
* guix/scripts/package.scm (guix-package): Likewise.
* guix/scripts/refresh.scm: Likewise.
* guix/svn-download.scm (svn-fetch): Likewise.
* tests/builders.scm (%bootstrap-inputs, %bootstrap-search-paths):
  Likewise.
* tests/packages.scm ("GNU Make, bootstrap"): Likewise.
* tests/guix-package.sh: Likewise.
* gnu/services/base.scm: Use 'canonical-package' instead of xxx-final.
* gnu/services/xorg.scm: Likewise.
* gnu/system/vm.scm: Likewise.
* guix/scripts/pull.scm (guix-pull): Likewise.

gnu/services/xorg.scm

@@ -19,7 +19,8 @@
 (define-module (gnu services xorg)
   #:use-module (gnu services)
   #:use-module (gnu system linux)                 ; 'pam-service'
-  #:use-module ((gnu packages base) #:select (guile-final))
+  #:use-module ((gnu packages base) #:select (canonical-package))
+  #:use-module (gnu packages guile)
   #:use-module (gnu packages xorg)
   #:use-module (gnu packages gl)
   #:use-module (gnu packages slim)
@@ -40,7 +41,7 @@
 ;;; Code:
 
 (define* (xorg-start-command #:key
-                             (guile guile-final)
+                             (guile (canonical-package guile-2.0))
                              (xorg-server xorg-server))
   "Return a derivation that builds a GUILE script to start the X server from
 XORG-SERVER.  Usually the X server is started by a login manager."
@@ -89,7 +90,7 @@ EndSection
     (gexp->script "start-xorg" script)))
 
 (define* (xinitrc #:key
-                  (guile guile-final)
+                  (guile (canonical-package guile-2.0))
                   (ratpoison ratpoison)
                   (windowmaker windowmaker))
   "Return a system-wide xinitrc script that starts the specified X session."