Merge branch 'master' into core-updates

Conflicts:
	gnu-system.am

gnu: Adjust synopses as recommended by 'guix lint'.

Remove leading articles and trailing periods in package synopses.

Merge branch 'master' into core-updates

Conflicts:
	gnu/packages/image.scm

gnu: Consolidate databases in (gnu packages databases).

* gnu/packages/databases.scm: New file, with the contents of the
  following deleted files.
* gnu/packages/mysql.scm, gnu/packages/postgresql.scm,
  gnu/packages/recutils.scm, gnu/packages/sqlite.scm,
  gnu/packages/bdb.scm: Remove.
* gnu-system.am (GNU_SYSTEM_MODULES): Adjust accordingly.
* gnu/packages/apl.scm, gnu/packages/dc.scm, gnu/packages/games.scm,
  gnu/packages/gnunet.scm, gnu/packages/linux.scm, gnu/packages/mail.scm,
  gnu/packages/mpd.scm, gnu/packages/nvi.scm, gnu/packages/openldap.scm,
  gnu/packages/package-management.scm, gnu/packages/python.scm,
  gnu/packages/qt.scm, gnu/packages/rdf.scm,
  gnu/packages/version-control.scm: Adjust to new module name.

gnu: Add ncmpcpp.

* gnu/packages/mpd.scm (ncmpcpp): New variable.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

Merge branch 'master' into core-updates

gnu: libmpdclient: Add native input doxygen.

* gnu/packages/mpd.scm (libmpdclient): Add native input doxygen.

Merge branch 'master' into core-updates

gnu: Add ncmpc.

* gnu/packages/mpd.scm (ncmpc): New variable.

Merge branch 'master' into core-updates

Conflicts:
	gnu/packages/libwebsockets.scm

gnu: Add mpd.

* gnu/packages/mpd.scm (mpd): New variable.

gnu: Add libmpdclient.

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