add basic support for configuration load checking

Signed-off-by: jlucidar <jlucidar@gmail.com>
change app name

Signed-off-by: jlucidar <jlucidar@gmail.com>
Re-add probe button to UI.  Add probing states to machine model.  Clean up some logging.
Merge branch 'issue14' of https://github.com/ShopBotTools/FabMo-Engine