COMP: Fixed compiler warning about possible uninitialized variable.
ENH: Allow building without VTK for performance improvements.
COMP: Fix compilation for when MGHIO is not present.
STYLE: Rename tests for easier debugging

The test naming relationships are now more consistent between
the running of the test and the comparision of the outputs.

When a secondary comparison program is run to test outputs
(i.e. landmarks) of another program, then the tests should
share a common name suffix.
ENH: Update ITK to latest master version 20131109