Autosave crashfix

caused by 'div by 0' exception
init submap to fix possible undefined behaviour

Related to nondissapearing electric clouds:
http://smf.cataclysmdda.com/index.php?topic=2658.0
Merge fixes to nasty crashes.
Revert "Sounds that can distract monsters from following you for a short while."

This reverts commit 7e95eb03e28fc79cbde86bf984a2a418af8d13bd.
This was making zombies indifferent to the player, they'd act normal for a turn or two, then seemingly forget the player is there.