Changed many functions in the abstract *Link classes to be const. This facilitates setting other functions as const. The metadata for specific links are reset when the links are added.

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.

Cleaned up serial link handling, eliminated double menu entries and safeguarded the link list. Did intentionally not improve the object dependency issue, will work on that on a global scope

Working on better simulation implementation, fixed a bug where the port handle was not fully released

Added not yet working version of logging / log replay, fixed ALL bugs in main window, enabled full persistence in main window and serial link.

Added new options for windows serial port, fixed a number of bugs, added customizing options to instrument widgets

QGroundControl now compiles under Visual Studio 9 / 2008. Google Earth support for Windows close to work.

First semi-usable version with new menu layout based on autopilot. Still very experimental. Current Bug: Linecharts do not work. Need to find out why