Fix compatibility with automatically configuring newer ublox modules

The current auto-configuration uses a "no longer supported" method to set the desired output messages from the ublox.
Currently, it sets the configuration for 4 outputs ports at once but starting with ublox 5, there are 6 I/O ports and this command no longer works. 
See Section 4.5 "How to change between protocols" in GPS.G6-SW-10018-F
http://www.u-blox.com/images/downloads/Product_Docs/u-blox6_ReceiverDescriptionProtocolSpec_%28GPS.G6-SW-10018%29.pdf

This pull request sets the configuration of only 1 output port. That output port is determined by the port that receives the configuration message.

Fixes #645