Patch with re-worked ISO code.
Sorry I didn't get a chance to look through this patch before it was committed.
I ran the current trunk through ISOOVER.LUA on D10 and it gave the expected results: Converting the sv_market + base back to ISO gives returns the input ISO values within a small margin. The difference between the sv96 and sv96_market + delta is always 69. The ISO override and misc values display also agree very closely with the selected value.
The one issue I see is that SV96_MARKET_OFFSET and the other associated conversion factors need to be able to be overridden for the old cameras like a410, s80, sd500 etc. For these cameras, the offset ranges between +20 and -4. These are the ones that have CAM_SV96_MARKET_OFFSET defined.
