ENH: restore non-DTI part of Neurosurg.MarkupsTest
Restoring the non-DTI parts of the NeuroSurgicalPlanningTutorialMarkupsSelfTest that were removed in:
https://github.com/Slicer/Slicer/commit/2d54809b42b7e0b11402e44e74776be4fdbf9977
Because it is a useful test of a variety of functionality.