Rewrite of MultiBackend driver with separate functions for all ILS driver methods. Fix to checkCapability to work properly with drivers using __call() magic method and more data to supportsMethod() for better decision-making including the possibility to use supportsMethod also without _call(). Updated MultiBackend tests.
Merge pull request #200 from KDK-Alli/multibackend2

Rewrite of MultiBackend driver with separate functions for all ILS drive...