countPointsInPolys: Count points within a polygon
In gsk3/taRifx.geo: Collection of various spatial functions

Overlays points on polygons and create a new polygon dataset with the count of the points in that polygon

1	countPointsInPolys(points, polys, density = FALSE, by = NULL)

`points`	SpatialPoints
`polys`	SpatialPolygonsDataFrame
`density`	Return a density (point count divided by area) instead of a point count
`by`	Factor to return counts by. For instance, if by is a factor with two levels, instead of a single count variable being returned, two variables will be returned– the count of point type A in the polygon, and the count of point type B. The by factor must be of length length(points).