Deleted accidental file.
Finished pretty board printing, changed Main to print a starting board.
Major board representation changes.

Saved a whole 4 masks on board representation, and more importantly
made `get` and `set` far easier to implement. Having these functions
lets me do away with most of previously exposed interface to Board
records.

Pieces are now colourless — it makes a lot of things nicer.

Changes in `Pretty` only reflect the other changes.

I also fixed a forgotten module in the cabal file.
Added mask movement primitives and movement datatypes.
Added a todo list.
Fixed module desciptions.