r.cost INFINITY patch

[Pierre de Mouveaux]

Hello,

here is a patch to r.cost (main.c file).
This patch is against Grass5.0beta7.

to apply the patch, just go into grass/src/raster/r.cost/cmd
the do a:
	parch -po -u < rcost.diff

and do a :
	gmake5.

(No need to rebuild the links)

I slightly changed the algorithm, so there is no more references to any infinite
value.

I tested both the new code and the patch application, so anything should go
seamlessly. 


Sorry for the annoyance,

Pierre.
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