Various fixes for 13.11 release

Fix NPE when removing flight configurations.
Restore the TubeCoupler configuration window.
Moved the Motor configuration into its own tab in BodyTube and InnerTube to reduce overall size of the config dialog.
Updated to MigLayout 4.0 (latest release which is easy to download).
Corrected layout of comments tab in component configurations which seemed to look bad with new MigLayout.
Reuse the MotorChooserDialog so previous settings are held on to.