Update libpndman and use the recommended defaults

Updates masterlist to:
http://repo.openpandora.org/client/masterlist?com=true&bzip=true

Which include bzip2 compression and commercial pnd listing.
Changes syncing to work with DELTA syncs which should work good now.
Add failure and syncing notification. Don't allow concurrent syncing.
Merge pull request #1 from Cloudef/master

Update libpndman and use the recommended defaults