combine coprocessing tests into a single test
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
The CoProcessingTestPythonScript, CoProcessingPythonScriptGridPlot, and CoProcessingPythonScriptPressurePlot tests should be combined into a single test with more thorough output information since the first test just runs a script and the last 2 tests just compare the output images from the first test. So a failure in the first test may only be noticed in the other 2 tests and give a false impression of what's wrong. This also should be done for the PCoProcessingTestPythonScript, PCoProcessingPythonScriptGridPlot, and PCoProcessingPythonScriptPressurePlot test.