configuration overview

[Alan Batie]

I've been using freeradius for quite a while now, but never really
grokked the config file.  There is lots of documentation that gives you
a narrow peep hole into the specific section it's concerned with and how
to do common basic things, but there's nothing I've found that really
talks about the structure of it and how everything interacts, which
makes it hard to even know where to start to do something new, much less
anything even slightly out of the ordinary.  I don't suppose there's
something out there that I've missed by chance?