Merge pull request #518 in CASA/casa6 from CAS-13665 to master
* commit '33cebe8ec636cf2515af33c1bc969554a1373173': (36 commits)
update inline help about dosubtract
deleted a misleading text in inline help.
rename do_fit() and do_apply() to _do_fit() and _do_apply()
put fit/apply logic out of the main task code
am empty commit
update test062 to check blparam files, plus refactoring
update the task behaviour related to dosubtract, overwrite and outfile
clean-up
added test cases for param files, plus update the code
move sdbaseline's helper functions back to task_sdbaseline.py
remove except clause in the main part of sdbaseline
change order of conditions for less execution of functions
using list comprehension in task_sdbaseline
using list comprehension in test_sdbaseline
remove CASA5 dependency in test_sdbaseline, plus apply appropriate Exception class
add unit tests for sdbaseline helper functions which are moved to sdutil.py
simplify is_all_blank()
update remove_data()
remove unused variables mtitles and ctitles
remove unused variable ftitles
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