Modifications needed to do the following:

Modifications needed to do the following:

1) if the run number stored in the CDBmanager is negative, the CDB is accessed with run 0. The cache for ITS is temporarily disabled and the calibration objects, stored in AliITSDetType* are deleted by the container class destructor.
2) if the run number is >=0, the cache is enabled and the calibration object are not deleted by the ITS container destructor
3) if the GetCalibration method is called more than once per run, the access to CDB is not attempted more than once
Massimo