Don't link unknown likes.

Likes/Dislikes of unknown channels have disabled links now.
Fixed intention a bit, romved a unused variable.
feeds with '@' in the URL were being handled as webfinger addresses and didn't fall through to RSS discovery. Issue #599
Merge pull request #600 from dawnbreak/master

Don't link unknown likes.
we don't always set HUBLOC_FLAGS_DELETED but we often set hubloc_status = HUBLOC_OFFLINE instead. Filter this as well from deliveries.
Merge https://github.com/friendica/red into pending_merge
private mail from d* to r# seems to work with these edits. - Now have to go back the other way.
Merge remote-tracking branch 'upstream/master'