CELL's size fixed

Bug fix!

Now GRASS_WIDTH and GRASS_HEIGHT should work correctly.

ftp://geni.knu.ac.kr/pub/geni/patch/grass/grass5.0beta8-CVS/

README.ct2
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1. r.weighted.cn compilation failed.

README.rt7
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1. Incorrect rows and cols of CELL is fixed.

Regards,
Huidae Cho