New DVCS and TCS observables

A couple of new observables added:

DVCSCrossSectionUUDVCSSubProc
DVCSCrossSectionUUDVCSSubProcPhiIntegrated
DVCSCrossSectionUUMinusPhiIntegrated
DVCSCrossSectionTotal
TCSAfb

Edited May 26, 2020 by Pawel Sznajder

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