add next_scenario_append
more debugigng info
try commenting out carryover before mp_connect
carryover wml is no longer handled by team_init

moved the wml merge step from carryover_sides.transfer_to,
it is now handled in a playcampaign function do_carryover_WML
this is added to start of play_mp
also a clear function which clears the carryover WML data
DBG_NG -> LOG_NG, and add clear_carryover_WML
merge "allow_new_game" before doing the mp ui