Fixing problem with resolution of multiply defined attribute nMethod (class nonstationarytransportproblem, derived form stationarytransportproblem).
Fixing missing modification from previous commit.
Adding initial support for oofeg visualization of raw (non smoothed) element data on tr_shell01
Fixing bugs in tri-quad hex interpolation.
Added triquad-hex export for vtkxml. Correcting a few obvious flaws in hexa21stokes (which still doesn't seem to be perfect).