Terminate session if a stream fails and can't be removed from the session

Ignore-this: ad3eb3010d424b235888cc84f60cb083

darcs-hash:20121112153137-56b4d-90e1d3270e2224105e55c09ece92932f314683d9
Removed extended-away state from PIDF extension

Ignore-this: 7743e0d947cd93ea8a23a03135c96aee

darcs-hash:20121115121438-56b4d-79672501d2d13aeadb3dc38a4d2db0c29477ffd0