Add the RS lookup table printout to the RegionSelector unit test

To make debiugging the RS lookup tables more straight forward, added the table printout to the RS unit tests, so now the unit tests explicitly write out the lookup tables

This means that now running the unit tests, eg

% python DetectorDescription/RegionSelector/python/RegSelToolConfig.py  SCT

will now also write out a map file with the lookup table. Remeber, that the unit test alone does nothing, as all the detector subsystems are disabled, so you have to specify which subdetectors you want.