g7 update:
* Simpler loader code
* capt_seq.c rewritten using code_gen (add long time exposure support)
* add filewrite task support
ixus960_sd950 update:
* Simpler loader code
* boot.c, capt_seq.c and movie_rec.c rewritten using code_gen
* add long time exposure support
* add filewrite task support
Tested by koshy: http://chdk.setepontos.com/index.php?topic=11723.msg116055#msg116055
powershot N update from waterwingz in http://chdk.setepontos.com/index.php?topic=650.msg116053#msg116053
* DNG active area adjusted to match actually used rows & columns in RAW data.  It now also passes the Adobe DNG test.
* capt_seq.c modified so that RAW/DNG images captured correctly it the shutter ring is pressed quickly (no half press).
* Checks in the user custom palette code improved to avoid modifying palettes when the necessary pointers are uninitialized.
* Added comments on where x & y touch position was found.