Upgraded for Batteries 2.0
v4l2: better error message when pixel format doesn't match
v4l2_decode_mjpeg: renamed from v4l2_decode_frame
v4l2_test: Upgraded for Batteries 2.0
Cnc.power: added
V4l2common.frame#rgb: renamed from decode
V4l2: minor fix
V4l2: support YUV422
V4l2: small sanity check, don't pass on 0-byte frames