Add option to calibrate calo digits

Jean-Francois Marchandrequested to merge
jmarchan-getCalibration into master

Add option to calibrate calo digits at the decoding level. To be used by the pi0 calibration.

Also needs Detector!275 (merged) for dd4hep compilation which needs lhcb-conddb/lhcb-conditions-database!31 (merged)

Edited by Miroslav Saur

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