Merged revision(s) 2899-2902 from trunk:DATE_STAMP propcase for propsets 2 and 4, mycolors propcases for propset 4, from msl in http://chdk.setepontos.com/index.php?topic=650.msg101945#msg101945 and waterwingz in http://chdk.setepontos.com/index.php?topic=650.msg101953#msg101953
DATE_STAMP and mycolors propcases for propset 1
mycolors propcases for propset 2
Enable "dark frame subtraction" and "USB remote sync" for the IXUS100_SD780 from waterwingz in http://chdk.setepontos.com/index.php?topic=650.msg101963#msg101963