Draft: Added an optional flag allowOverwrite to the thread-safe overload of...

Added an optional flag allowOverwrite to the thread-safe overload of GeoAlignableTransform::setDelta()

The value of this flag gets forwarded to GeoVAlignmentStore::setDelta(). The concrete implementations of the GeoVAlignmentStore interface are expected to decide what to do if a client attempts to overwrite delta for an alignable transform that already has its delta recorded in the given store.

GeoModelCore/GeoModelKernel/GeoModelKernel/GeoAlignableTransform.h

@@ -21,7 +21,7 @@ class GeoAlignableTransform final : public GeoTransform
   virtual GeoTrf::Transform3D getTransform(const GeoVAlignmentStore* store=nullptr) const override;
 
   /// Sets an alignment delta
-  void setDelta(const GeoTrf::Transform3D& delta, GeoVAlignmentStore* store=nullptr);
+  void setDelta(const GeoTrf::Transform3D& delta, GeoVAlignmentStore* store=nullptr, bool allowOverwrite=false);
 
   /// Clears the alignment delta
   // To Do: This method will become obsolete once we migrate LAr to the Alignment Store.