[GRASS5] Small parser problem

[Markus Neteler]

Hi developers,

kudos to Huidae for fixing the i.in.erdas... It crashed
on selected platforms with selected files only, but
he got it!

Well, another story:
d.rgb b=kiel.1 g=kiel.2 b=kiel.3
     ^^                ^^
leads to segfault... (it took me a while to realize the problem).
The parameters of d.rgb are set to
  required   = NO;
which makes sense here.

However, the *parser* should realize if a parameter is
specified twice and error/exit on this.

Maybe a volunteer could implement that test? Sorry, I don't
have too much ideas about the GRASS parser...

Thanks in advance

 Markus

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