doc: Change `HACKING' to refer to guix-devel@gnu.org.

Reported by Alex Sassmannshausen <alex.sassmannshausen@gmail.com>.

* HACKING: Replace "bug-guix" by "guix-devel".

derivations: Add #:dependency-graphs to `build-expression->derivation'.

* guix/derivations.scm (build-expression->derivation): Add
  #:dependency-graphs keyword argument.  Pass it to `derivation'.
* tests/derivations.scm ("build-expression->derivation with
  #:dependency-graphs"): New test.
* doc/guix.texi (Derivations): Update `build-expression->derivation'
  description.

derivations: Add #:dependency-graphs `derivation' parameter.

* guix/derivations.scm (derivation): Add `dependency-graphs' keyword
  parameter; honor it.
* tests/derivations.scm (bootstrap-binary): New procedure.
  (%bash): Use it.
  (%mkdir): New variable.
  (directory-contents): Add `slurp' optional parameter.
  ("derivation with #:dependency-graphs"): New test.
* doc/guix.texi (Derivations): Update accordingly.

derivations: Move 3 positional parameters into keyword parameters.

* guix/derivations.scm (derivation): Turn `system', `env-vars', and
  `inputs' into keyword parameters.
  (build-expression->derivation): Adjust accordingly.
* gnu/packages/bootstrap.scm (%bootstrap-guile): Likewise.
* tests/derivations.scm, tests/store.scm: Likewise.
* doc/guix.texi (Derivations): Likewise.

gnu: Add Guile-Lib.

* gnu/packages/guile.scm (guile-lib): New variable.

download: Add kernel.org mirrors.

Fixes <http://bugs.gnu.org/15182>.
Reported by Mark H Weaver <mhw@netris.org>.

* guix/download.scm (%mirrors)[kernel.org]: Add ftp.be.debian.org and
  mirror.linux.org.au.

hydra: Comment out all Git invocations in `bootstrap'.

* build-aux/hydra/guix.scm (tarball-package): Comment out all `git'
  invocations.

hydra: Add missing import.

* build-aux/hydra/guix.scm: Use (srfi srfi-26).

hydra: Return a symbol/thunk pair.

* build-aux/hydra/guix.scm (hydra-jobs): Return a symbol/thunk pair.

gnu: pius: Use the right `gpg' binary.

* gnu/packages/gnupg.scm (pius): Add GnuPG as an input.  Patch the
  installed binaries to refer to the right GnuPG executable.  Fix
  synopsis.

hydra: Extract the actual file name from the Guix checkout.

* build-aux/hydra/guix.scm (hydra-jobs): Extract the `file-name' part of
  CHECKOUT.

hydra: Add job to run "make distcheck" on Guix.

* build-aux/hydra/guix.scm: New file.
* Makefile.am (EXTRA_DIST): Add it.

gnu: Add Guix.

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

build-system/gnu: Add `dist-package'.

* guix/build/gnu-dist.scm: New file.
* Makefile.am (MODULES): Add it.
* guix/build-system/gnu.scm (%default-modules): New variable.
  (gnu-build): Use it.
  (dist-package): New procedure.

packages: Allow file names as package sources.

* guix/packages.scm (package-source-derivation): Add cases for SOURCE as
  a store path or user file.
* tests/packages.scm ("package-source-derivation, file",
  "package-source-derivation, store path"): New tests.

doc: Mention what's in the chroot, and add a caveat about /dev/shm.

* doc/guix.texi (Setting Up the Daemon): Document the default content of
  the chroot, and the /dev/shm caveat.

gnu: Add pspp.

* gnu/packages/maths.scm (pspp): New variable.
* THANKS: Thank John Darrington for help with debugging.

gnu: Add libmicrohttpd.

* gnu/packages/gnunet.scm (libmicrohttpd): New variable.

gnu: Add units.

* gnu/packages/maths.scm: New module.
* gnu-system.am (GNU_SYSTEM_MODULES): Add module.

gnu: Add libextractor.

* gnu/packages/gnunet.scm: New module.
* gnu-system.am (GNU_SYSTEM_MODULES): Add module.
* THANKS: Thank Christian Grothoff for help with debugging.