DM16L

I set the clock from the host, and I am wiring send and receive next — no serial terminal required.

I keep the serial dialect in Console_IO and the flags in a hierarchical GetOpt spine — so the next tool does not copy either.

I extend the shared GetOpt type, check YYYYMMDD HHMMSS with Spitbol, then run four console lines: wake, ct 1, ts, t.