[GRASS5] g51: v.surf.rst

[Radim Blazek]

Hi,

I updated rst library and v.surf.rst (should replace [sv].surf.rst).
I have done some simple tests only, it would be nice if somebody could
try and compare results to rasters created in g50 - should be identical.

Note that point (sites) vector may be created by v.in.ascii by
piping points as 'x|y[|z][|cat]' to v.in.ascii without 'input=' option.

Z values may be read from:
1) z coordinates in 3D file ('field=0')
2) from category value
3) from db table ('zcol=name'), smooth may be specified by 'scol'

Radim