[GRASS5] [bug #4145] Patch for: (grass) r.patch -z eats holes in data

[Cedric Shock]

Interested parties,

I have fixed this bug. The attached patch contains both tested code changes 
for this bug and rewording of description.html to make it obvious that the 
current region heavily influences the output of r.patch

Description:
r.patch: Closes bug 4145 by replacing zero and null values with data and null 
values with zeros when using -z flag. Description.html partly rewritten to 
describe the effect the current region has on r.patch.

--Cedric Shock
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