Merge pull request #42 in CASA/casa6 from CAS-12830 to master
* commit 'df303607ce99169c70f4a512e231e0576d1ac322':
Renamed merged tests to fit their function
Renaming test_gaincal to test_req_task_gaincal
Converting test_gaincal to be merged with test_req_task_gaincal
Removed old test_gaincal from the CMake list and the unittests_list
Added the merged version of the test to casatasks
Changed the name of test_gaincal to test_req_task_gaincal
Merged test_gaincal with test_req_task_gaincal