Fixing Voronoi sort.

Updating Voronoi sort to include all points in each neighbor within some
radius. Fixes points on the side of the fine region neighbors.

Voronoi sort now includes all points which are closer to the region
center than to any of the 2nd layer neighbor centers.

This can be thought of as an expanded Voronoi cell for each region, that
extends roughly halfway through the 1st layer neighbor centers.
Adding sort method for points in Voronoi cell.

Also added diagnostic output to determine the average number of points
in a Voronoi

Removing unused variables.
Speeding up sort_in_vor.
Updating Voronoi Sort Options.

Adding a "full" Voronoi sort method that includes the full set of
neighboring region's points within some radius.

Updating defining the previously added Voronoi sort to be called
"Expandable Voronoi Sort" which also has an auto correcting option where
if the LInf norm is ever >= 0.1 the owned Voronoi cell is expanded by
~2.5%, in an attempt to correct the SCVT.