1. Increase performance speed (at_phys call by reference)
2. VTK: streamlines embed vector magnitudes in vtkOSUFlow filter

	modified:   ../.gitignore
	new file:   ../README
	modified:   ../VTK/VectorFieldVTK.cxx
	modified:   ../VTK/VectorFieldVTK.h
	modified:   ../VTK/examples/StreamlineRenderUnstructured.cpp
	modified:   ../VTK/examples/gcbStreamlineVTK.cpp
	modified:   ../VTK/vtkOSUFlow.cxx
	modified:   ../src/Element.h
	modified:   ../src/Field.C
	modified:   ../src/Field.h
same as previous commit
1. Fix: In adaptive step size, OSUFlow did not clamp when the step size was adjusted larger than the given maxStepSize
2. Update test sample runs in tests/data