ixus30_sd200, ixus40_sd300: fix minimum allowed ISO override
a490 remote capture update from nafraf in http://chdk.setepontos.com/index.php?topic=4338.msg103856#msg103856
preliminary fix for various remote capture issues, especially in continuous mode. blocks raw hook until preceding jpeg is completely done. discussion: http://chdk.setepontos.com/index.php?topic=4338.msg103785#msg103785
camera.h cleanup and corrections from nafraf in http://chdk.setepontos.com/index.php?topic=650.msg103955#msg103955
a3200: Define CAM_EXT_TV_RANGE, undefine CAM_HAS_IRIS_DIAPHRAGM and CAM_HAS_ERASE_BUTTON
a3000: Define CAM_EXT_TV_RANGE, undefine CAM_HAS_IRIS_DIAPHRAGM
ixus105: Undefine CAM_HAS_IRIS_DIAPHRAGM
ixus300: Define CAM_EXT_TV_RANGE
Fix comments in: a3000, a3100, ixus1000, ixus110, ixus115.