branch for dng file write task testing
dng test - code from work-3 patch http://chdk.setepontos.com/index.php?topic=9970.msg100729#msg100729
dng test - write header in task, use msleep(0) to start, don't force one write per chunk, better handling of uncached and multi raw buffer cams
dng test - make chunk and margin adjustable from lua for testing
dng test - instrumented version
dng test - add rev chunk count to stats
dng test - increase dng_writer stack, remove sleep(0)
dng test - time header creation, move header cleanup into write task
dng test - combine header and thumbnail writes
dng test - get uncached bit from camera_info, macros simplify use
dng test - speed up thumbnail creation
dng test - use pre-calculated gamma buf
dng test - put byte reversing in new task, keep writing in main (spytask)
dng test - allow open and close to happen in parallel with reversing
dng test - fix compiler warning for changed dng_write signature
dng test - improve end chunk behavior for vxworks
a650 - user alternate raw buffer with dng, reported to work by Lebeau in http://chdk.setepontos.com/index.php?topic=9970.msg101120#msg101120, clean up unused cruft
dng test - remove debug and timing code
dng test - missed dng_test.h in cleanup
speed up dng by reversing in parallel with writing, brings DNG save time within 200ms or less of CHDK raw for most cameras. discussion in http://chdk.setepontos.com/index.php?topic=9970.0