added a pair of "True" cases to the set of test cases to satisfy the code coverage analyzer
restructured a pair of `if` tests to obviate the use of `continue` -- to satisfy the coverage analyzer
added back the border around the targeted feedback
adjusted left alignment of targeted feedback text to match answer text
fixed the pro forma True test (to satisfy the coverage analysis)
added targeted feedback unit tests to exercise the `targeted_feedback_available()` logic
fixed a couple of minor errors found by quality analysis
new filename for the tests which were originally in the hacked file `test_targeted_feedback_1.py`
that file is obsolete now
fixed a couple of minor errors found by quality analysis
name changes to make the code easier to read
added name and contact info to the AUTHORS file
added two items to the CHANGLOG file