Option for using detector regions with the appropriate set of volumes and production cuts.

A detector region configurator has been added with region settings (e.g. name, secondary production thresholds, list of root logical volume names) that are the same (or very close to) that is used in production. These configurations were generated by using the G4PhysicsRegionConfigNew.py and G4GeomtryToolConfig.py scripts from Athena.

Adding detector regions can now be activated by the following UI command:

/mydet/addRegions 

A given region is added only if at least one of the corresponding root logical volume can be found in the geometry, while it's simply skipped otherwise without any problem.