Select Spots Center close to Filaments Border

This xtension finds spots whose center is within a user specified number of microns of the border or edge of the filament. For example, find all spots that are within 1.0 um of the edge of the filament. This is a modification of the existing "Spots Close to Filament" which the existing xtension a ratio of the spot position to the local radius of the spot. Not Compiled.