Another change for issue #3, SerialLink::getCurrentPortS() should now return consistant results on Windows to match linux and OSX

Addition of requestReset to LinkInterface, to allow MavLinkProtocol to detect when connected, but at the wrong baud rate, request a reset.

Changes for new calibration in APM 3.0 (Re: https://github.com/diydrones/MissionPlanner/issues/38), and change in some of the serial timeouts

Modified SerialLink.cc so that it follows the same cross-platform restrictions as the QSerialPort library it relies on.
Windows compilation was broken during 94e91013, which is what prompted this refactoring.

Minor cleanup, fixed a bug where the serial port would not connect on first application launch on Linux

port has to be closed and deleted in the same thread as it was created. changed the disconnect function

Set to 38400,8,N,1 just need to map the baud rate enums now.