added functions to create global waypoinst, modifying the WaypointList class, MapWidget and MainWindows.

add the functionality to erase the list of Waypoint widget (WaypointView) from the button of the WaypointList widget

add widget WaypointView to widget WaypointList when create a waypoint with mouse over the map

Major refactoring of the waypoint code. The new design fits the model-view-controller pattern better.

Major cleanup of MainWindow constructor. All widgets have now the visible property set to false on its constructor

UASWaypointManager now implements the protocol described in http://qgroundcontrol.org/waypoint_protocol

current status of the waypoints is transmitted, crashes due to a bug in waypointplanner - the crash has to be fixed