little bug, fix follow

Wrap text in change subject dialog and use a bigger width. Subjects are usually long and on one line.

fix arguments of on_open_chat_window functions. It is called from callbacks, so first argument is widget.

 * Show all groups in merged accounts view that have online contacts. Fixes #3890
 * Allow metacontacts over several accounts. Fixes #3889
 * Fix on_drop_in_group when two accounts in merged view have the same contact
 * Fix potential traceback when receiving a message

It's cleaner and less error prone, so simply use it everywhere.

http://python.org/dev/peps/pep-0008/ " Comparisons to singletons like None should always be done with
'is' or 'is not', never the equality operators."


Apply do roster_window. See r9488.

This is only a simple port of the old non-modelfilter method. Functionality not restored yet: Custom colors are lost when refiltering the model.

Change the way last_history_time for room is saved. Save time in mem at each message logged. When closing
control, save the value in rooms_last_message_time table. Previous version could introduce duplicate logs or
messages not logged.

Moved newly created auto_join_bookmarks() to good source file.
Fix :
-when using bookmark auto from join dialog : Action rebuild now done; Add GC sorted in list
-when using gc_control->bookmark : Store password if any.