example of ashlar function

I added a texture to POV-Ray to simulate the appearance of a wall made of rectangular interlocking stones of unequal size. The code is here. It hasn't really been integrated cleanly into POV-Ray - the easiest way to test it is to comment out one of the patterns in patterns.c and copy and paste in my code, renaming "DBL ashlar(VECTOR EPoint)" so it looks like the removed pattern. It's been tested with Megapov 0.5. I'm hoping someone will take my code and integrate it into Megapov or POV-Ray.
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