SUMMARY:
Lots of small bug fixes, and a big update to the ovfx2 driver.

PER-FILE CHANGES:

Makefile:
- Add ovfx2.o to the default build

README:
- Add some ovfx2 info

ov511.c:
- Move i2c_detect_tries to ovsensor.h, and increase it to 20
- Rearrange the function prototypes: one less #ifdef
- Remove some useless /proc debug messages
- Move init_ov_sensor to ovsensor.c, and modify it to take a struct i2c_client
- Un-inline some functions
- USB_ISO_ASAP => URB_ISO_ASAP for 2.5.45+
- Update for 2.5.45 descriptor changes

ov511.txt:
- Trivial cleanups
- Update "compress" and "ov518_color" parameter docs

ovfx2.c:
- Switch V4L format to BGR24
- Reduce packet size to 16384. 65536 was causing problems.
- Move i2c_detect_tries to ovsensor.h, and increase it to 20
- Rearrange the function prototypes: one less #ifdef
- s/ov511/ovfx2/g
- Remove some /proc/.../info entries that aren't relevant
- Remove some useless /proc debug messages
- Move init_ov_sensor to ovsensor.c, and modify it to take a struct i2c_client
- Implement the OVFX2-specific picture controls. For some reason, they don't
  work yet.
- Un-inline some functions
- Fix handling of the clock divider
- Add some new custom (OV7620) sensor settings, and turn interlacing off
- Move OVFX2-specific sensor settings to the end of mode_init_regs(), so that
  the other sensor settings don't ruin them
- Add image post-processing functions. Some of them are unnecessary and will be
  removed in the next version, but are here for future reference.
- Remove the experimental read() function
- Refine the init register sequence a bit, based on Windows driver
- Fix a 2.5 kernel compilation bug in ovfx2_probe()
- Reenable URB unlink from disconnect()

ovsensor.c:
- Add init_ov_sensor()

ovsensor.h:
- Add I2C_DETECT_RETRIES
- Add init_ov_sensor() prototype