GPodder.net podcast status synchronzation.

Based on playlust synchronization.

Result of the 2011 Google Summer of Code project by Lucas Lira Gomes.

Podcast subscriptions on gpodder.net will be automatically added and
synchronized with Amarok's local podcast provider.
Actions performed on the local podcasts will be send to the gpodder.net
service thus enabling synchronized podcast listening between Amarok and
other devices and computers running a gpodder.net compatible client.

CCMAIL: gpodder-devel@lists.berlios.de
REVIEW: 102844
GUI:GPodder.net podcast provider, automatically synced with local podcasts.
DIGEST:GSoC project merged into Amarok master.