To finally (!) be able to cut on HV values, a method AliMUONCalibrationData::PatchHVV...

To finally (!) be able to cut on HV values, a method AliMUONCalibrationData::PatchHVValues was added,
which will remove extraneous HV values (read from OCDB) in the cases where
the ramp-down was started before the end of run

At the same time, AliMUONRecoParam was updated to a) remove the high limit on HV (not likely to be
ever used) b) have one HV (low) limit per chamber, instead of just St12 vs St345, so we have a finer
control.

(Laurent)