[GRASS5] New operation to v.select: noverlap

[Wolf Bergenheim]

Hi!

This patch adds another option to v.select, "noverlap". This is the
opposite of overlap. So all fetaures not in b are selected from a.

I haven't really tested this with all kinds of areas, so it might still
be buggy, but please try it out and let me know. I'll happily fix any
buggs I have added.

--Wolf

-- 

<:3 )---- Wolf Bergenheim ----( 8:>

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