Quite a bunch of changes, most of which are for debugging and never should make it into a pull request. Still, pushed here so the curious can have a look.
FIX: don't call gb->set_pos(), it will result in segfaults.
Merge remote-tracking branch 'upstream/passenger-generation' into paxgen-dirty
Remove debug fprintfs from a bunch of places
FIX: renovate_city_building return value
ADD: Statistics for jobs/visitor demand for individual cities (not yet used)
Merge branch 'paxgen' of https://github.com/pipcet/simutrans-experimental.git into passenger-generation
Merge remote-tracking branch 'upstream/passenger-generation' into paxgen-dirty
FIX: Crashes when cities build buildings on occasions (Philip)
Merge remote-tracking branch 'upstream/passenger-generation' into paxgen-dirty

Conflicts:
	bauer/hausbauer.cc
copy working version from paxgen branch
Revert "copy working version from paxgen branch"

This reverts commit cdcb13409a8a9e3016dc1f4a6e34bce94ab0a27e.