first commit of improved level generator. Now cities are not connected from the center but rather from the boarders. NESW

Updated flatland 2.0 example
added new feature: Malfunctioning agents will automatically resume operation when they are fixed

fixing bugs on building trainstations and number of agents limited by the number of built train stations

minor bug fixes in node connecting algorithm

All starting positions are valid.
Check for feasibility of map is not yet done.

Now turns with the agent, encodes local information which can easily be enhanced by predictions, distance map and other things.