Merge pull request #419 in CASA/casa6 from CAS-13526 to master
* commit '99b83faabb8124f0b642f824bbf4784f0dcfdfbd':
differing print statments still caused error. created a different write to std error function
added alternate error printing when using python2
moved merged test to casatasks and removed old vishead test. Updated the unittestlist file and CMake file
renamed test_vishead to test_req_task_vishead
merged test_vishead and test_req_task_vishead
Merge pull request #421 in CASA/casa6 from CAS-13444 to master
* commit '80aeaf54c9a506abef608c2da414b250f4e9939e':
added import of casalog to test_importasdm_mms.py
Copied test_importasdm_mms from casa5 to casa6. Made both tests compliant with Python 3 and identical to each other. The tests handle when mpi is not available in the system and runs in serial in both linux and macOS.
fixed incorrect type of new SDM_CORR_BIT column
Added SDM_CORR_BIT column to SPW table following past practice of other SDM_* special columns. Same handling in MSTransform classes as other SDM_* columns. Added checks in test_importasdm.py and test_sdm_toms.py
