Merged revision(s) 2905 from branches/release-1_1:
Fix raw save problem on short shutter press for IXUS70.
http://chdk.setepontos.com/index.php?topic=10257.msg102210#msg102210
Add ability to force flash to Auto and set flash exposure compensation.
Fix tools/Makefile to delete gensig executables when doing 'make clean'.