- Prepared the login screen but empty for now
	- Renamed reread_xml by reread_menu
	- Now the noxrandr param is 'almost' persistant in the config file
	  'almost' because until you enter and quit the gcompris config
	  panel, it is not saved. This is very dangerous becaus after that
	  there is no way to put back xrander in since there is no --withxrandr
	  switch.
	  WARNING: This need more works !!