FIX: avoid applying the cornering speed limit to all vehicles when
debug_corners is set
FIX: allow factory generation code to build non-power-plant factories again
FIX: typo resulting in very large visitor demands for new factories with fields
Merge branch 'james-factory-visitor-demand' of https://github.com/pipcet/simutrans-experimental.git into way-improvements
Merge branch 'james-fix-debug-corners' of https://github.com/pipcet/simutrans-experimental.git into way-improvements