sx100is update:
- simpler loader code
- port rewritten using code_gen
- Tested by koshy: http://chdk.setepontos.com/index.php?topic=11831.msg117346#msg117346
usb remote zoom update from waterwingz in http://chdk.setepontos.com/index.php?topic=650.msg117331#msg117331 (slightly modified) - zoom more than one "step" on cameras with many steps.
Fix for S100 zoom positioning from waterwingz:
http://chdk.setepontos.com/index.php?topic=650.msg117333#msg117333