gkeys/actions.py: Add nick to validation and glep check header
gkeys/checks.py: Remove 'a' restriction on checks

Not checking authentication subkeys was causing wrong data to be displayed.
Even though these subkeys are ignored for the final spec pass/fail.
gkeys/checks.py: Change a logging.debug from ERROR to WARNING

This deta_t change is not an error.
gkeys/checks.py: Improve addition debug print()s for consistency