Fix description for PowerManagement units.
minidlna: Start after networking.target.

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
Merge pull request #235 from the-kenny/fix-minidlna

minidlna: Start after networking.target.
WIP: Add services.samba.nsswins option (FIXME: not working yet!)

This option allows for seamless WINS/NetBIOS name lookup, using
nsswitch.