Shinko/Sinfonia printers

I just committed initial support for the Shinko/Sinfonia CHC-S1245, CHC-S6145, and CHC-S6245 into Gutenprint. They use print job structures similar to the S2145, and appear to share the same basic driver core, so the odds are high that the existing S2145 backend will work with only minor changes.

So, if there's anyone out there with one of those models (or better yet, some low-level documentation on their communication protocol) drop me a note, and from there we should be able to get things working pretty quickly.

There's still the CHC-S8145 and the DP-1045 to sort out, but those are for another time.

I think that's it for printer hacking for a while, barring bug fixes and the ongoing Mitsubishi CP-D70/D707/K60 saga. Testers needed...