When registering a new account, instead of using on_connect_success handler, register disconnect handler with the connection as soon as we create it. Hacky, but works. Fixes #2671.

  - Assume Gajim is running if pid's commandline contains 'gajim' anywhere. (The chance that it's some other process is very small, better safe than sorry.) (Linux only)
  - On non-Windows OS without /proc, assume Gajim is running if pid file exists.

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