[GRASS5] r.patch: accept more files and new flag

[Markus Neteler]

Hi all,

I have extended the number of accepted files in r.patch from
10 to 50. Hope this is o.k.

Then I want to add a new flag:
-z  Use zero (0) for transparency instead of NULL

I feel this is useful if you have common maps and want to
avoid extra work due to NULL assignment. 

This flag is implemented more or less (currently commented 
in Gpatch.c), but the zero (0) check is missing. I am not 
shure how to implement this check properly (file do_patch.c).
If somebody could assist here ... :-) The updates are in CVS.

Thanks in advance

 Markus

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