INN config file parsing infrastructure

[Forrest J. Cavalier III]

> What do people think?  Any additional comments before I start writing
> code?  This structure should also be writeable as well as readable,
> although I haven't fully fleshed out all of those details in my head (but
> I've gone far enough to convince myself there are no fundamental
> limitations that would interfere with that).

To make things clearer, can you provide some Perl .def
examples showing an item with two parameters and also including
a subgroup with two parameters?  (With comments, default values, 
etc.)