Basic MultiImageFileset test.
Move helper methods to library.py
Fix failing delete test. Fixes #10823
Fix argument to exception during callbacks.
Add some basic MIF chgrp tests.
Add some basic MIF delete tests.
Add further basic chgrp tests.
Update & complete chgrp testBadCaseChgrpOmeImage() PASSES
Minor changes to testBadCaseChgrpAllImages() FAILS
Tiny typo fix in test library.doSubmit()
Update testBadCaseChgrpOneDataset(). FAILS
Update testBadCaseChgrpAllDatasets() PASSES
Update testGoodCaseChgrpDataset() FAILS
Added post chgrp check to testBadCaseChgrpAllImages()
chgrp.py Add 'test_should_pass' param to doAllChgrp()
NEW testTwoFilesetsChgrpImages() FAILS
NEW testTwoFilesetsChgrpDataset() FAILS
Fix doAllChgrp(test_should_pass=True)
Removing last 2 redundant MIF tests from chgrp.py
Use dataset.proxy() and image.proxy() in new links