New parameter in CaloDataType (@vchekali)

Marco Cattaneorequested to merge
cherry-pick-d8290ce7 into run2-patches

Add isPhotonXGB parameter, to be used by CaloHypoEstimator to store result of new photon/pi0 separation classifier.
Cherry picked from !1348 (merged) on 2018-patches

Edited by Marco Cattaneo

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