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Update GModelIO_RAD.cpp

Paul Sharp requested to merge Radioss_PhysicalGroupSupport into master

Update GModelIO_RAD.cpp to support the PhysicalGroup export of node and element groups in Radioss Format (previous version of GModelIO_RAD.cpp wrote these in LS-DYNA format), handling of 2d groups is still a little clunky in this version since Radioss requires separate group types for triangle (SH3N) and quadrilateral (SHEL) elements, current approach is to loop over dim2 groups twice and write both types of group for all 2d elems, this leads to redundant groups but is easier to resolve in editor later than no groups!

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