[Gulliby]

Requested by gulliby

Before. intsmith order A N showed the order and the smallest primitive root, but there was no way to see how many primitive roots N has.

After. order --roots A N adds one last line roots with that count (0 when N has no primitive root, otherwise phi(phi(N))). Without the flag the output is unchanged; for a non-unit residue the status line stays, roots follows it and the exit code stays 1.

$ python -m intsmith order --roots 3 7
residue   3
phi       6
order     6
smallest  3
roots     2

How. intsmith/commands/order.py declares the --roots flag and prints the line; five new test cases in tests/test_cmd_order.py (four exact outputs, one --roots takes no value error); one sentence added to the order bullet in the README. Usage text and cli.py are untouched.