David E. DeMarle authored Jan 22, 2019 and Sebastien Jourdain committed Mar 01, 2019

Removed DataSet API from HTG and removed ComputeDualGrid.
Using FieldData instead of PointData or CellData for arrays.
The implicit dual grid output of HTG itself as a dataset no longer exists.
Reduce test threshold
Remove usage of GetNumberOfPoints() and replaced by GetNumberOfVertices()
Rename MaterialMask by Mask
CEA contrib fix for vtkAdaptiveDataSetSurfaceFilter
Add missing parent Initialize() call

GridSize still needs to be used for now until Dimensions/Extent is fixed