COMP: change VTK build script to work with all CMake Generators

BUG:  --simpleTensorModel flag went away

BUG: Cell2Mat didn't handle input vector with variably sized matrices

Replaced with --fullTensorModel, which defaults to false.

COMP: use vtkDataSetAttributes::SetScalars/SetTensors to add data to vtkPolyData to write out

See https://www.icts.uiowa.edu/jira/browse/PREDICTIMG-3505 The
complaint is that Slicer is not liking the VTK files made
by fiberbundle.