Pull request #968: CAS-14563
Merge in CASA/casa6 from CAS-14563 to master
* commit '002d541f647ebfad76592de87f08941da5cd0957':
edited comment to test CAS-14563 - Added a log message for the single beam case CAS-14563 : Edits after code review. Updated test scripts to use datasets from casatestdata. CAS-14563 : Enable perplane beams with feather