Merge pull request #124 in CASA/casa6 from CAS-12700 to master
* commit 'c119e5d4b67b7dd21ff810d2075c51e4af79da48':
remove persistent products in tearDown
put general removal of files in tearDown
remove image products of tests
remove old test_imtrans scripts
added test_req_task_imtrans.py tests CAS-12700 create test_req_tool_ia_transpose