[CABLELIST] add option string to 'saturn' cable,

[lviollette]

Current status:

• The saturn cable is only defined using the ftdi port and default PID, VID. See cablelist.txt

Current issue:

• any other factory-default FTDI devices plugged in to the computer will be detached as part of the discovery method.
• there is currently no difference between a factory-default FTDI device and the way saturn cable is defined.

Goal:

• ensure a 100% match when discovering potential USB devices.
• do not detach other FTDI by mistake

Fix:

• add option string to cablelist.txt file

XC3SPROG cablelist.txt option format (refer to ioftdi.cpp, function IOFtdi::Init):

:vendor  :product  :description                   :channel  :dbus_data  :dbus_en  :cbus_data  :cbus_en
:0x0403  :0x6010   :Saturn Spartan 6 FPGA Module  :0        :0x00       :0x0B     :0x00       :0x00

saturn product page: https://numato.com/product/saturn-spartan-6-fpga-development-board-with-ddr-sdram/