Doxy style

I know that style is a very contentious subject.  I've made changes assuming that the primary audience for the dev docs is agent/module developers.  Cyclus kernel developers will probably just be in the code, or can easily tweak doxy config options themselves.  I've done a few things here:

* removed various pretty diagrams that I felt were not really helpful for agent developers: collaboration diagrams, call graph diagrams, etc.  that were in the way of the useful api doc.

* made function args be on as few lines as possible instead of one per line.

* Moved class detail section to be at the top of the class page instead of way down below the function signatures and other diagrams

* removed distracting/cluttery borders and shadow effects

* Removed lists of "this function references ..." and "... references this function".

* Removed private members.  Again - I am assuming we are targeting module developers.

* Unhid code comments in code browser

And a few other minor tweaks.  Feel free to disagree - I'll adjust this to consensus.