First pass at making AI drowning aware. No concerns of performance, only applied to bazooka (not bat/fp etc)

Minor optimisation for AI to cut down on hwSqrt calls

bug #336

Add div to allow safe integer division from lua

Recount team health if modifying hedgehog health

Set default empty ammo sets. Current mission handling appears to not pass any default ammo set, so script was never getting a chance to set its own.

Avoid rare double decrement.

Prevent pirate ship from repeating on Islands, remove vertical line in art landback

bug #370

Oh, should also check for game finish when player quits without ROUNDFINISHED message: small refactoring, not tested at all

comment out reserve to maintain old Qt compat

Also consider game finished when the last player reports ROUNDFINISHED despite the correctness parameter.

Someone might find this useful. Plan to link to it from the wiki.

Fix for bug #366, delete gear if hog is drowning (needed either that or a check on nil Gear^.Hedgehog^.Gear)