The C++ design is supposed to give a loosely coupled, highly extensible
code base.

I'm interested in C++ design patterns, so any comments (even flames) about
the standard of my code/design are welcome. n.b. I know about the
following issues.

- throwing of exceptions in constructors, tsk tsk.
- "suicidial" constructors (delete this)
- Poor, non constructor/destructor automated memory management in places

For the curious, look at the base classes FGConnectionInterface,
FGPickerInterface and FGActionInterface. These interface definitions are
at the core of the programs extensibility.

One day I might copy my UML diagram into an art package and include it :-)