Fix header test.

Change-Id: Iece2472200148ff8fd351113d2e97f17b6da0b5f
Add documentation to vtkSMTrace.

Change-Id: I279223f9b79096752fd226f7700ef760594654ec
Merge topic 'refactor_python_tracing_2' into next

f19d6eb6 Add documentation to vtkSMTrace.
31a4990b Fix header test.