- Added printph module parameter, for debugging cameras that never send image
  data, or send all zeros.
- Enabled OV7620 brightness and contrast controls
- Enabled OV7620AE brightness control
- Added code to detect when an OV7620AE is being used with an OV511+ and force
  it to configure as an OV7620. This fixes the no-image problem on such cameras
- ov511.h: Added reminder to update ov511.txt when changing sensor enumeration
- ov511.txt: Updated sensor parameter documentation to match values in ov511.h
- ov511.txt: Added printph parameter documentation
- ov511.txt: Updated TO-DO list