FIX: For some unaccounable reason, very large aircraft (747s in Pak128.Britain-Ex) would in the depot check before departing falsly report that they had no power or speed, causing them incorrectly to report "incorrect vehicle assembly". This is a workaround fix, as the basic problem is undiagnosed.
FIX: Correct spelling error in "unprotect_abondoned_player_months = unprotect_abandoned_player_months (was "abondoned" - the old word will still work, however.
CHANGE: Increase default setting for unprotecting abandoned players from 3 to 10 years, which works better in longer network games.
Merge branch '11.x' into passenger-generation

Conflicts:
	simutrans/config/simuconf.tab