a590 updates from nafraf in http://chdk.setepontos.com/index.php?topic=650.msg103445#msg103445
Updated ISO override code.
http://chdk.setepontos.com/index.php?topic=10341.msg103282#msg103282
Enable flash exposure-compensation for external flash, when using CHDK ETTL flash override. Tested on G12, G1X & SX40 using 580EX & 90EX.
Change remote 'synch_delay_enable' & 'synch_delay_value' menu items to use new style (single menu entry).
Update shooting_set_iso_mode function to work with market ISO values as well as CHDK ISO id values. Will find nearest match to requested ISO in iso_table and set ISO_MODE accordingly.