Use the correct backpath to redirect operator after login
Add "userId" and "agentId" fields to thread at client side
Use valid types for Thread fields
Remove Thread::setupAvatar method
Remove "get_logged_in" function
Fix comments for AbstractProcessor::processFunction method
Restrict access to a thread for third-party users

Fixes #71
Use "once" method instead of "on"/"off" in JS message form
Forbid users to post to closed threads

Fixes #72