Testing workarounds and fixes

There is a recent bug in paraview that assigns the wrong path to $PARAVIEW_TEST_BASELINE_DIR in test scripts. (ParaView doesn't use that var in any xml scripts, so the bug has been undetected since June.)

• This branch modifies the ColorKnee test to workaround the PV bug.
• Separately, a typo that prevented the ModelSelection test from being enabled is also fixed, and that test script is also updated to workaround the PV bug.

One baseline image is also updated for the ModelSelection test.

For baseline image change, click here

Previous ModelSelection5.png	New ModelSelection5.png