Pull request #946: CAS-14557: CLONE of CAS-14337 for 6.7.1 (ATM changes)
Merge in CASA/casa6 from CAS-14557 to release/6.7.1
* commit '7178787b6607bbcb3fb14f516ade91d0d53577e1':
Update casaplotms to 2.6.3 in build.conf
build.conf use casaplotms wheel made from this branch, CAS-14557
increase range of phase values in test_smsettrop, CAS-14557
bring ATM update from CAS-14337, CAS-14557