Added device-local callbacks for links and connections to python bindings.
Merge branch 'master' into python-device-callbacks

Conflicts:
	swig/mapper.i
Rename mdev_add_*_callback() functions to mdev_set_*_callback() for API consistency.
Finish adding device link and connection callbacks to python bindings.
Added python test for device callbacks.
Added example python program showing demonstrating the use of device connection callbacks to label control widgets with the name sof connected signals.