branch master updated (64a7192 -> 7e9b07b)

[Ludovic Courtès]

civodul pushed a change to branch master
in repository guix.

      from  64a7192   gnu: racket: Update to 6.2.1.
       new  e3e1ecf   gnu: Add RPM.
       new  5e1c936   gnu: Add python-file.
       new  9685661   doc: Add a REPL example.
       new  e49de93   ui: Add 'matching-generations'.
       new  deaab8e   guix system: Extract action processing.
       new  d50cb56   utils: Add 'readlink*'.
       new  ad18c7e   ui: Add procedures to display a profile generation.
       new  5b516ef   guix system: Factorize boot parameter parsing.
       new  65797bf   guix system: Add the 'list-generations' command.
       new  3bb168b   utils: Add 'switch-symlinks', moved from (guix ui).
       new  06d45f4   profiles: Add generation manipulation procedures.
       new  7dae1f4   gnu: Add xcompmgr.
       new  7e9b07b   gnu: Add yapet.

The 13 revisions listed above as "new" are entirely new to this
repository and will be described in separate emails.  The revisions
listed as "adds" were already present in the repository and have only
been added to this reference.


Summary of changes:
 doc/contributing.texi               |   24 ++++
 doc/emacs.texi                      |    2 +
 doc/guix.texi                       |   47 +++++++-
 gnu/packages/backup.scm             |    1 +
 gnu/packages/package-management.scm |   83 ++++++++++++-
 gnu/packages/password-utils.scm     |   32 +++++
 gnu/packages/python.scm             |   27 ++++
 gnu/packages/xorg.scm               |   42 ++++++
 guix/profiles.scm                   |   80 ++++++++++++-
 guix/scripts/package.scm            |  198 +----------------------------
 guix/scripts/pull.scm               |    1 +
 guix/scripts/system.scm             |  235 ++++++++++++++++++++++++-----------
 guix/ui.scm                         |  127 ++++++++++++++++++--
 guix/utils.scm                      |   36 ++++++
 14 files changed, 659 insertions(+), 276 deletions(-)