NEW FEATURES:
- Added device: Lifeview USB Life TV PAL D/K+B/G
- Added 336x264 resolution for OV518
- OV518 frame rate should be *much* higher now.
- Added tuner support for USB Life TV PAL/SECAM. Might not work yet.
- ov518_decomp.c: Added support for greyscale (YUV400). May not work yet.

BUG FIXES:
- Changed some usb control transaction fields to match Windows driver:
  - Changed transaction types to USB_TYPE_VENDOR
  - Changed OV511 register read bRequestType from 2 to 3
- OV518 image at < max resolution is now centered properly
- OV518 YUV400/YUV420 selection code fixed
- ov51x_decompress() should fail if palette==greyscale and no YUV400
  decompressor available
- Fixed test for whether to deinterlace frame (should work better w/ PAL now)
- ISO completion handler should only issue warning if bad data is received
- file->private_data is used to store video_device pointer in V4L functions.
  This removes some possible races upon disconnect and provides a small
  performance enhancement. (Credit: Gerd Knorr)

INTERNAL CHANGES:
- ov511.h: Removed registers 0x2c and 0x2e from mode_list_518
- ov511_decomp.c: 2D iDCT rewritten with macros, greatly reducing the code size