fbsync: Only import comments when the toplevel poster wasn't ignored
fbpost: Don't queue posts when the posting seems to fail with a specific error
Links now are directed to target="_blank"
fbsync: Detection of comments to blocked accounts now really should work ...
fbsync: Detection of comments to blocked accounts improved
Merge pull request #183 from annando/master

Improvements in fbsync/fbpost, target for urls set to "_blank"