Tagging v0.2.9.2, a maintenance release. Warning: support for threading has been temporarily disabled; it needs more work when UIDs change rapidly. Significant changes since v0.2.9.1: - Bugfix: handle rapid sequence of new message arrivals and expunges - Bugfix: take care not to skip pending requests for downloading message parts - Better UIDNEXT guessing - Increased unit tests coverage - XtConnect: fix issues with "stuck messages"