SelectGeodesics changes

Changed to select the longest bar among bars 1 through n (so at least
one geodesic will be chosen).  This change still does not check that the
geodesic is chosen from both ends.
Minor edits in comments etc.

Minor edits in GeodesicPlot.m, HOPGeodesics_main.m and hopmaxconnect.m.
Mostly comments and cleanup.