add an ACE option to disable the fact that gajim auto-expand and selects the contact who sent last message. fixes #2911

add a now argument to the send function, so that stanza is sent instantly instead of added to queue. Use it to send answer to adhoc command when we disconnect. fixes #3008 and #2808

warning and information dialogs are now no more modal, but transient for parent. This means all windows are usable even if such a dialog is opened, but dialog stays above parent windows. Parent is roster window. fixes #3035

jid. fixes #3031

[Mikhail Gusarov and me] Use listeners when an event is added / removed to the events class and use them to update systray.

when we compare 2 offline contacts, the one which has a status messages is shown above the one without. fixes #3010