#13 Integrate PGN interface

[Andy Baskett]

It would make testing and algorithm testing much easier
if there was a [black box] interface to process PGN.
That way, we could take PGN records of thousands of
real games and run them through the move vaildator
checking our output with that of a real game.
We could very quickly cover thousands of possible
scenarios and create ourselves a really simple
regression test.

[Jonathan Evraire]

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I agree. Full PGN notation would be pretty easy to do,
however short notation might not be. I'll be looking into
this, thanks.