Ensured that generated levels are possible

I wrote a pathfinding algorithm that will attempt to solve boards as they are generated. I tried a variety of algorithms, most of which either did not terminate in a timely fashion. Depth-first search, with a tendancy towards moving towards the center, proved to be the best algorithm, and managed to solve boards the other algorithms timed out on. Because the algorithm was mostly tested on levels 0-9, and level diversity increases dramatically past that point (to the point where, past level 50, I am concerned that actual impossible boards may appear), I cannot be completely sure that the algorithm will perform as desired. To help debug, the program will dump a string representing a board state if an impossible board is generated.

Also fixed a bug in wrap().

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