NEW FEATURES:
- 352x288 resolution for OV518
- ov518_decomp.c: Added dynamic dequantization code, for better image contrast
  and quality.
- ov518_decomp.c: "nouv" (no color) is now a module option, vs. a compile-time
  option

BUG FIXES:
- bRequest field for OV518control transfers should have been 1. This fixes:
	- Lack of quantization tables in image data
	- Failure to upload quantization tables
	- Broken/cut-off frames
	- 352x288 resolution
- Fixed debug code in i2c_w_raw()
- ov518_decomp.c: Removed unnecessary code that limited resolution to 320x240

INTERNAL CHANGES:
- OV518 packet headers are only printed for first packet of image
- ov511_decomp.c: Comment updates
- ov518_decomp.c: Added code for printing quantization tables, if debug=5.