added smack 3.3.1 to cots
collaboration now uses smack directly for XMPP
moderate code cleanup on collaboration.comm
added double click to start chat in participant list
Former-commit-id: 8ece30944a [formerly 6fc85f79c126283eb4dbddfa94943523d9ff0a6d]
Former-commit-id: e6c4b39aca