Merge pull request #516 in CASA/casa from CAS-11009 to master
* commit '2431c850a02b1a521c2bd300b1ed910e9ce4b2d0':
Removed visstatold test
Remove 'xstat', and clarify 'axis' vs 'reportingaxes' parameters
Change instances of "measurement set" to "MeasurementSet" in xml
Remove visstatold and visstat2 from build and casa.py
Remove visstatold and visstat2