v2.2.12

• Add new "single" attribut for FTDI devices.

  FTDI devices could be selected with a module index (read value of
  some pins) or a serial. In some setups there is only one module
  present which can be identified with the VID and PID only. The
  new attribute "single" checks for exactly one device with the
  VID and PID. It throws an error if 0 or more than 1 devices with
  this VID and PID are found.

  Example for the syntax:

                    <FTDI vendor="0x0403" product="0x6010">
                           <Device single="true"/>
                    </FTDI>