Add tests for new output options: derived quantities, functionals, and gauges about pyclaw HOT 6 OPEN

I have added the psystem as a test, including writing these things out. But I need help (from @ahmadia) checking the output files.

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Did this test ever get worked out? I am moving some data objects around and wanted to make sure that this is still working and if not to find a work around.

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actually I've previously added a test for gauges but it was failing
for some choices for -np in parallel run

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Was it disabled then in the nosetests? I ask because I may have changed some path stuff with gauges and wanted to make sure everything still worked.

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Actually it is not disabled. The test is in:
pyclaw / apps / psystem_2d / test_2d_psystem.py

I think I will disable it until I fix it. Actually the issue is related to determining gauges indices in parallel. but for
serial run and for example 4 processes it worked..

I'm looking into it now..

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@amal-ghamdi - can you give us an update on this issue?

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