[GRASS5] v.to.db 2 new features compactness and perimeter

[Wolf Bergenheim]

Hi!

I fixed my fix for supporting compactness in v.to.db. I also added
support for perimeter option which calculates the perimeter of an area.
Compactness is calculated by doing:

compactness = perimeter / 2 * sqrt(M_PI * area)

which gives a circle the value 1 and all other shapes have a larger value.

Please have a look at my patch, and LMK if you think something is
strange or out right wrong. I have tested these new options a bit, but I
haven't really tested them on weird / broken material. I have also not
tried to calculate the perimeter or compactness of lines. (;

--Wolf

-- 

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

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