Add point option as input for v.overlay

[voncasec]

Currently with v.overlay, we can only use operators (and,or,not,xor) for extracting lines or polygons from feature A given feature area B. It would be nice to expand this option to include points as a possible Feature A class.

Currently, If I wanted to select all points that do not fall within a given polygon, I would first have to create a vector area for the given region (v.in.region), then I would have to run v.overlay using the 'not' operator to create an area feature that excludes the polygons of interest, than I would run v.select to select the points that fall within the new polygon.