Merge pull request #509 in CASA/casa6 from CAS-13644 to master
* commit 'c22556747639721cb9394a3b38f823ec77069044':
Moved up the --ignore_list option and added more examples how to run.
Additional Notes added for ignore list
Update to runtest README.md
More changes to the runtest.py documentation
Adding documentation to runtest.py
Merge pull request #510 in CASA/casa6 from CAS-13489 to master
* commit '22d4db65e0e3a4f5a9029d2c9bef562c87dc76ad':
add note re: uv -> image coordinate system not being expected
updated Unit test to String test
updated docs re: units handling
implemented unit handling for uv-plane -> image-plane transform
implemented units handling for image plane -> uv-plane transform
remove test data products