Short-term TODOs:
- see if we can reuse some code from the original DUN preflet
- add "Extras" tab for changing dial-behaviour (auto-redial, dial-on-demand, etc.)
- add "Revert Changes" button
- load add-ons
- write IP (IPCP) protocol add-on
- move DEVNOTES into a doxygen file and document the rest of the API
- use dynamic window positioning based on screen size instead of static coordinates
- really delete interface description files when removing an interface
- open dialog asking for interface name when creating a new interface

Long-term TODOs:
- (maybe) allow selecting multiple authenticators (in expert-mode)
