cleanup of alignment specific code in DetDesc

Sebastien Poncerequested to merge
sponce_fixAlignSpecificCode into master

goes together with Alignment!161 (merged)

Essentially dropping ownToOffNominalParams method from IGeometryInfo (was unused) and not triggering anymore the updateManagerSvc on the update of deltaMatrix in GeometryInfoPlus

Edited by Sebastien Ponce

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