Merge branch 'ps/unit-test-c-escape-names.txt'

Merge branch 'ps/unit-test-c-escape-names.txt'

The unit test helper function was taught to use backslash +
mnemonic notation for certain control characters like "\t", instead
of octal notation like "\011".

* ps/unit-test-c-escape-names.txt:
  test-lib: print escape sequence names