Merge branch 'master' into core-updates

Conflicts:
	Makefile.am
	guix/scripts/gc.scm
	guix/scripts/package.scm
	guix/ui.scm
	tests/guix-package.sh

gnu: global: Update to 6.2.8.

* gnu/packages/global.scm (global): Update to 6.2.8.

gnu: Fix invalid `license' fields.

* gnu/packages/acl.scm (acl): Change `license' field to refer to the
  `license' objects.
* gnu/packages/attr.scm (attr): Likewise.
* gnu/packages/compression.scm (xz): Likewise.
* gnu/packages/global.scm (global): Likewise.
* gnu/packages/linux.scm (linux-libre-headers): Likewise.

distro: Rename (distro) to (gnu packages).

* distro.scm: Rename to...
* gnu/packages.scm: ... this.  Update all users accordingly.
* Makefile.am (MODULES): Adjust accordingly.
* po/POTFILES.in: Likewise.

distro: Change the module name space to (gnu ...).

* distro: Rename to...
* gnu: ... this.  Update module names accordingly.
* Makefile.am: Adjust accordingly.
* po/POTFILES.in: Likewise.
* distro.scm: Search for files under /gnu/packages instead of
  /distro/packages.
* gnu/packages/base.scm (ld-wrapper-boot3): Likewise.

distro: Add GNU GLOBAL.

* distro/packages/global.scm: New file.
* Makefile.am (MODULES): Add it.