Add camera_name and module_name columns to sps_camera table.

sps_camera is a static table with one row per camera. One function it provides are canonical identifiers for each camera. To simplify various routines it would be useful to have both a camera_name column, e.g. "b3" and module_name column, e.g. "sm3".

I guess we could add a function, but for a 16-row table I don't see the gain.