better pid behaviour. we now in process list if pid contained in gajim.pid is still gajim. fixes #2165. (Linux only)

do not count priority and if contact is a transport when computing metacontact score when contact is offline. fixes #2691

change resource of incoming event when a resource disconected between the moment we get the message and the moment we read it. see #2657

if print_time==sometimes : Show the day if needed also. Use locale for time format (do
not force
24h)
Delete a lot of unused locale variables (thanks pychecker)
del gajim.py useless global vars after use
configpaths.py : use self. not this.

Delete duplicate code

add hide this menuitem for systray menu in windows. GTK/win32 SUCKS. do not ever use it for your own project unless it is something trivial

#2200.