traffic: new method of finding place of worst traffic
tiles: isOverWater should include plain water tiles
traffic: route around bad congestion, use railroads, don't walk on water
traffic: implement TrafficGen2.parsePath

This is not used now, but it should be useful once the new save-file
format is implemented.
debug- function to dump zone connections
debug: show price points on main map display
debug: on query tool, dump traffic information to console
traffic: more disciplined fitness function
city: implement CityLocation.parse()

which reverses the CityLocation.toString() method
traffic: change data types of dist[] and cameFrom[] arrays
traffic: track walking, driving, and transit separately
debug: trafficgen map to console