Update in trigger code:

Update in trigger code:
 - Creating shuttle preprocessor (AliMUONTriggerDCSSubprocessor) for getting
   trigger RPC HV and currents.
 - Add Trigger RPC HV and currents in QA.
 - Removed class AliMpHVNamer (using AliMpDCSNamer instead to handle both
   tracker and trigger)
 - Changed some variable, data members and function names to be consistent
Also:
 - Updated documentation of class AliMUONTriggerDisplay with further details.
(Diego)