Python UI tests can no longer be supported in ParaView. They are no necessary
anywways. Most of the testing can be done with XML. Convert few more tests to
Python.

Adding the following to the top of Python test script helps with the conversion:

class CQtTesting:
  def playCommand(self, o, c, a):
    print '  <pqevent object="%s" command="%s" arguments="%s"/>' % (o,c,a)

class CQtTestingImage:
  def compareImage(self, o, b, w, h):
    print '  <pqcompareview object="%s" baseline="$PARAVIEW_DATA_ROOT/Baseline/%s" width="%d" height="%d" />' % (o, b, w, h)

Change-Id: I04d5a289c58ce503d9beda69839a6c7f1abeee4c