added list of keys applicable to winovf2vtk within 'test_winovf2vtk_keys_no_parameters'. Begun creating test to check output is as expected if each key selected separately.
added list of keys applicable to winovf2vtk within 'test_winovf2vtk_keys_no_parameters'. Begun creating test to check output is as expected if each key selected separately.

fangohr/ovf2vtk,fangohr/ovf2vtk