FIX: build at the correct position
CHANGE: World statistics for jobs, population and visitor demand are now operational and based on the correct figures.
FIX: Crashes on saving in some cases.
Merge branch 'paxgen-fix-position' of https://github.com/pipcet/simutrans-experimental.git into passenger-generation
Merge branch 'passenger-generation' of https://github.com/jamespetts/simutrans-experimental into paxgen-dirty

Conflicts:
	simworld.cc
Merge branch 'passenger-generation' of https://github.com/jamespetts/simutrans-experimental into paxgen-dirty