Pull request #584: CAS-13821 immoments lustre-specific bug fix
Merge in CASA/casa6 from CAS-13821 to master
* commit '9de93b2bbc0b8e663ce82401efe3834b4e2711db':
yet more test fixes
bug fix
Fix typos in task_immoments.py
created images were not being removed in tearDown(), so fixed that CAS-13821 bug fix