Merge pull request #455 in CASA/casa6 from CAS-13224 to master
* commit 'ef5ed5b9993d30f845fbc0610bd0a7e766f01221':
Reduce memory use in fringe fit least squares step
Removed a stray comment
Merge pull request #456 in CASA/casa6 from CAS-13534 to master
* commit '5537adb178db22846b8ccdc7ba961f0fcdbc1ae8': CAS-13534 define test to verify the fix
include bug fix made in casacore