Fixed preliminarily: exception while deleting world.
Changed: some tiny performance optimizations.
CHANGE: More realistic way of dealing with the number of private cars on the streets at any one time.
FIX: Were far too many private cars around at any one time.
TODO: Remove artefacts of old system
FIX: Inappropriate removal of stops in some cases from convoys' schedules when access rights were withdrawn
CHANGE: Remove vestiges of old system for accounting for the number of private cars - should improve performance slightly.
FIX: Cornering weights were not properly considered when routing, leading to odd routes in some cases.
FIX: Prevent overflow in calculation of initial journey time. However, journey time is still limited to a maximum of 6,553.5 minutes (or 109 hours and 13.5 minutes).
FIX: For some reason as yet unascertained, convoys would sometimes become stuck when loading.
CHANGE: Allow/mandate greater routing depth to obviate the need for multiple waypoints for ship routes pending assessment as to whether this is viable in performance terms.
FIX: Railways and canals could be built over other players' railways and canals if that player had allowed access.
REVERT: Players can no longer change a schedule whilst a vehicle is loading so as to evade the loading time, thereby giving rise to an exploit.
CHANGE: A convoy whose schedule is changed while it is loading will now wait until it has finished loading before moving off on its new schedule.
CHANGE: Sending a loading convoy to a depot is only completed after the convoy would have finished loading.
Merge branch '11.x' into 12.x
Merge branch '12.x' into devel-new

Conflicts:
	simcity.cc
	simcity.h

Signed-off-by: James E. Petts <jamespetts@yahoo.com>
Merge branch 'devel-new' into 112.5-merge

Conflicts:
	dataobj/route.cc
	simcity.cc
	simcity.h
	simconvoi.cc
	simwerkz.cc
	vehicle/simverkehr.cc
	vehicle/simverkehr.h
Merge branch '112.5-merge' of git://github.com/BerndGabriel/simutrans-experimental.git into 112.5-merge
Merge branch '112.5-merge' into way-improvements
REVERT: Allow/mandate greater routing depth to obviate the need for multiple waypoints for ship routes pending assessment as to whether this is viable in performance terms.
FIX: The "traffic" graph in the city list window gave an inaccurately low number. This is now the correct number, being the sum of all individual cities' "traffic" graphs.
FIX: The "traffic" graph in the city list window had the old colour rather than the new colour for "traffic" in the city information window.
VERSION: Increment to 11.20