fixes #2556

the new setup requirements

they are in share/doc/gajim

switch autogen order
dist defs.py.in

use 'muc_message_received' sound if it is enable without checking notify_on_all_muc_messages option. Fixes #2494

cleaning Makefile.in-s in make maintainer-clean
skip noisy message in autogen.sh

fix install location for servers.xml

translation.py. Just do `make update-po`

print error message instead of raising a TB when Dbus is not present and we try to use gajim-remote. Fixes #2539

And fix a func name too

ask os_info for observers. fixes #2476. the same happens (and cannot be fixed) for invisible, but how often we ask os info on invisible people? (and also that can betray their invisibility eventhough it is their client that hsould not reply if they are invisible. anyways..)

allow shutdown func now get the method we used to close the tab. So that we check if a row is selected in gc control only if we close tab by pressing Esc key. fixes #2528