Consolidation of the classes used to get the calibration data stores from OCDB and...

Consolidation of the classes used to get the calibration data stores from OCDB and ASCII files/string.

This is particularly important for AmoreMCH.
Note that AliMUONTrackerIO has been improved as well (e.g. we no longer have multiple temporary TString objects)
While doing so, two bugs were corrected :

- Bug fix : corrected the interpretation of the HV switches (important both for QA and reco)

- Bug fix : corrected the display of the config in mchview which was wrong (again, important for AmoreMCH)