Merge pull request #1144 in CASA/casa from feature/CAS-12730 to master
* commit 'f019bf00da0b7e10ad979767f53306cc91509d37':
Adding the gaincal REQ test
Merge pull request #1143 in CASA/casa from bugfix/CAS-12517 to master
* commit '0694017cffa9d8548d11d45f625b82fc28ac8e8e': CAS-12517 : simobserve and accompanying test now work in CASA 5 and 6 as far as possible.
Merge pull request #1141 in CASA/casa from bugfix/CAS-12627 to master
* commit '221c6b56956b6bfb501d93fba590a4e2062f76e0':
bug fixes in ImageBeamSet
casacore ImageBeamSet::setBeam() fix
add test to verify CAS-12627 fix