First perft test

Here are the result of the first succesfull perft tests of my move generator:

    Depth    Nodes     Time
        1           20    0:00:001
        2          400    0:00.016
        3         8902    0:00.142
        4       197281    0:02.720
        5      4865609    1:05.221
        6    119060324   25:30.243

Not very impressive... Crafty does depth 6 in 6.23 seconds :S

Ideas for improvement:
- make a int wrapper for the moves
- don't recreate pieces (reuse)
- generate legal moves