Merge pull request #146 in CASA/casa6 from CAS-12869 to master
* commit '9a87515bc716a8947bc9690f91a48ba5d32ab6a7':
Added some additional files to the teardown and moved some teardown in the test_callib_field to the class teardown
For CAS-12869, test_callib_field in test_req_task_applycal.py needs clearcal task, so be sure to import it explicitly for casa6
For CAS-12869, copy repaired test_req_task_applycal.py from previous commit into casa6/casatasks
For CAS-12869, fixed import of callibrary.py for casa6.
For CAS-12869, added new test_callib_field to test fldmap maneuvering, including multi-field selection.
For CAS-12869, add selection mechanisms for parsing/using multi-field fldmap specifications
Merge pull request #147 in CASA/casa6 from CAS-12871 to master
* commit '19e9bf849340bb99f83bb7a1bb46f4349643910d':
bring symlink copy changes to CASA6 files, CAS-12871
uvcontsub: ensure MMS (symlinks) are be copied correctly, CAS-12871
cvel: ensure MMS (symlinks) are be copied correctly, CAS-12871
fixvis: ensure MMS (symlinks) are be copied correctly, CAS-12871
