gnu: mpv: Add features.

* gnu/packages/video.scm (mpv)[inputs]: Add libvdpau.
[arguments]: Add gpl3 and zsh completion flags.

gnu: Add vdpauinfo.

* gnu/packages/video.scm (vdpauinfo): New variable.

gnu: Add libvdpau.

* gnu/packages/video.scm (libvdpau): New variable.

gnu: Add autojump.

* gnu/packages/admin.scm (autojump): New variable.

gnu: hevea: Update to 2.28.

* gnu/packages/ocaml.scm (hevea): Update to 2.28.
  [arguments]: Add 'patch-/bin/sh phase.

gnu: unison: Add "doc" output.

* gnu/packages/ocaml.scm (unison)[source]: Use svn-fetch with snippet.
  [outputs]: New field.
  [native-inputs]: Add ghostscript, texlive, hevea, and lynx.
  [arguments]: Add 'install-doc phase.

gnu: samtools-0.1: Adapt to changes in "samtools" variable.

* gnu/packages/bioinformatics.scm (samtools-0.1)[arguments]: Add
  "LIBCURSES" make flag; delete "configure" phase; disable tests outside
  of "substitute-keyword-arguments".

doc: Document command-line options honored by the initrd.

* doc/guix.texi (Initial RAM Disk): Document kernel command-line
options.

linux-modules: Support 'modprobe.blacklist' on the command line.

* gnu/build/linux-modules.scm (file-name->module-name)
(module-black-list): New procedure.
* gnu/build/linux-modules.scm (load-linux-module*): Add #:black-list
parameter.
[black-listed?, load-dependencies]: New procedures.
Use them.

emacs: Add interface for system generations.

* emacs/guix-main.scm (system-generation-boot-parameters)
(system-generation-param-alist, system-generation-sexps): New procedures.
(entries): Add 'system-generation' entry type.
* emacs/guix-messages.el (guix-result-message): Use the same messages
  for 'generation' and 'system-generation' entry types.
* emacs/guix-ui-system-generation.el: New file.
* emacs.am (ELFILES): Add it.
* doc/emacs.texi (Emacs Commands): Document new commands.
* NEWS: Mention new interface.

emacs: Remove 'generation' search type.

Use 'installed' search type instead.

* emacs/guix-main.scm (%patterns-makers): Remove 'generation'.
  (package/output-sexps): Adjust accordingly.
* emacs/guix-ui-generation.el (guix-generation-info-insert-number):
  Replace 'generation' search with 'installed'.
  (guix-generation-list-show-packages): Likewise.
* emacs/guix-messages.el (guix-messages): Remove 'generation'.

emacs: Replace 'generation-diff' search with 'profile-diff'.

* emacs/guix-main.scm (generation-package-specifications): Rename to...
  (profile-package-specifications): ... this.  Take a single 'profile'
  argument.
  (generation-difference): Rename to...
  (profile-difference): ... this.  Take profiles as arguments.
  (package/output-sexps): Adjust accordingly.
* emacs/guix-ui-generation.el (guix-generation-list-profiles-to-compare):
  New procedure.
  (guix-generation-list-show-added-packages)
  (guix-generation-list-show-removed-packages): Use it.
* emacs/guix-messages.el (guix-messages): Replace 'generation-diff' with
  'profile-diff'.
  (guix-message-outputs-by-diff): Adjust accordingly.

emacs: Find packages in system profiles.

For a usual profile, packages are placed in a profile directory itself,
but for a system profile, packages are placed in 'profile'
sub-directory.  So we need to do some special cases for system profiles
to find packages there as well.

* emacs/guix-base.el (guix-packages-profile): New procedure.
  (guix-manifest-file): Use it.  Add optional 'system?' argument.
* emacs/guix-ui-generation.el (guix-system-generation?)
  (guix-generation-current-packages-profile):  New procedures.
  (guix-generation-packages, guix-generation-insert-packages): Remove
  'generation' argument.
  (guix-generation-packages-buffer): Add optional 'system?' argument.
  (guix-profile-generation-manifest-file)
  (guix-profile-generation-packages-buffer): Adjust accordingly.
* emacs/guix-main.scm (generation-package-specifications+paths): Rename to...
  (profile->specifications+paths): ... this.  Use a single 'profile' argument.

emacs: profiles: Add 'guix-system-profile'.

* emacs/guix-profiles.el (guix-system-profile): New variable.

Move <boot-parameters> to (gnu system).

* guix/scripts/system.scm (previous-grub-entries)
  (display-system-generation): Use accessors instead of matching
  <boot-parameters>.
  (boot-parameters, boot-parameters?, boot-parameters-label)
  (boot-parameters-root-device, boot-parameters-kernel)
  (boot-parameters-kernel-arguments, read-boot-parameters): Move to...
* gnu/system.scm: ... here. Export them.

gnu: Add python-hy.

* gnu/packages/python.scm (python-hy, python2-hy): New variables.

gnu: Add python-rply.

* gnu/packages/python.scm (python-rply, python2-rply): New variables.

gnu: Add python-astor.

* gnu/packages/python.scm (python-astor, python2-astor): New variables.

gnu: Add python-clint.

* gnu/packages/python.scm (python-clint, python2-clint): New variables.

gnu: Add python-args.

* gnu/packages.scm (python-args, python2-args): New variables.