flatpak: set appdata release version for dev version: appdata file can now use a template (which has the same name with "_tpl_" prefix), which is used in dev version to automatically set the release with the right Mercurial revision/date. Comment from org.salutatoi.Cagou.appdata.xml has been moved as first child of <component>, so it is not lost while parsing the file.

#!/bin/sh
# this script will launch the command with good D-BUS parameters
# it needs to be copied and made executable by frontends
export DBUS_SESSION_BUS_ADDRESS=tcp:host=sat,port=55555,family=ipv4
exec /usr/bin/$(basename "$0") "$@"