DGGRID
DGGRID copied to clipboard
DgHexC3Grid2D.cpp improvements
DgHexC3Grid2D and DgHexC2Grid2D are similar; move the shared functionality into a base class for 2D grids with a substrate and surrogate grid.
addFromSeq in DgHexC3Grid2D only works for Class I/III grids. Make separate classes for Class I/III and Class II/III grids. Fix addFromSeq for Class II/III grids.