Improve discrete compactness measures

[leehach]

Discrete compactness measures (in geo_discrete_measures, and unmerged in compactness_measures) use iteration of container and cells to cross join compare every geometric pairing. GDF.intersects run on each row of GDF. Instead, intersects method can run on entire GDF and return vector of Booleans. Count of Trues is the number of intersecting geometries (or contained, etc.) Doing it this way will be faster.