issue685275 - show retired/unretired items in roundup-admin add pragma display_header to print headers for display command. Header displays designator and retired/active status. Add doc of pragma to affected commands. Add test for code paths.

try:
    # Python 3+
    from ssl import SSLError
except (ImportError, AttributeError):
    # Python 2.5-2.7
    from socket import sslerror as SSLError    # noqa: F401