Improve messages from ABC_TESTING_ASSERT_DOES_NOT_THROW and ABC_TESTING_ASSERT_THROWS
Use parentheses around expressions evaluated in ABC_TESTING_ASSERT_*
Make ABCMK-TEST-ASSERT-FAIL/PASS’s output discernible when run through ABC Make
Improve code documentation
Move non-template abc::testing::test_case members to .cxx file
Add missing this from ABC_TRACE_FN