quick_frontend (widget, chat): implementation of new sync mechanism, first draft: QuickWidget implement base of sync mechanism with a sync property which can be overriden, and resync method which is called when resynchronisation is needed. When resync is required, chat widget get missing occupant and history elements A new callable argument can be used with historyPrint, when set it is called when history has been fully printed.

include MANIFEST.in sat/VERSION
global-include *.py
global-include *.ini
global-include *.po *.mo
global-include CHANGELOG COPYING* INSTALL README*
global-include *.sh
include src/sat.*
include misc
include frontends/src/jp/jp frontends/src/primitivus/primitivus
include src/bridge/bridge_constructor
global-exclude *.un~
prune src/bridge/bridge_constructor/generated