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.

Moved methods for opening new messages controls from roster.py to src/gajim.py. This is not roster related. See #3643.
Sorted src/gajim.py functions, using steve-e style :p

Contacts are now online hidden when they connect/reconnect and not completely removed/readded. Should come with a great speed improvement for people with big rosters.
There are still a few known problems but non that should dalay this patch any longer. Related bugs will be tracked with 'modelfilter' keyword.

See #1201

Use one function to join bookmarks automatically only. Fix bug "all bookmarks joined minimized when going back
from invisible". Not sure it's right place for this function.

show better error message when sending message to a room where we are no more connected. fixes #3870

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."
Comparisons to None part; second one...
roster_win.py is NOT checked here (waiting for modelfilter)

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."
Comparisons to None part
roster_win.py is NOT checked here (waiting for modelfilter)

Trying to ignore line for #3865