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

BUG:  --simpleTensorModel flag went away

Replaced with --fullTensorModel, which defaults to false.

COMP: try to figure out VTK Output Data problems in Slicer

See https://www.icts.uiowa.edu/jira/browse/PREDICTIMG-3505 The
complaint is that Slicer is not liking the VTK files made
by fiberbundle.