kList -- add an option to use external usb.ids file

[mcuee]

usb.ids file is here. Maybe it is good to add an option for the users to use the following URL for the latest usb.ids file or maybe a newer version of the file in the current directory.
http://www.linux-usb.org/usb.ids

[mcuee]

Ref: pyusb/pyusb#331