Updated doxygen file with the new, fairly complex aliasing system that allows for relatively clean systematization of doxygen documentation.

A few more small tweaks to the doxy file; also made it a public version that should be largely usable by folks who dl it.

Most important - changes to panels_save_display() that bring it fully into line with the various new variables and procedures for storing them. Also added some more default vars to the $display object to help avoid E_STRICT errors when they're otherwise unset. Plus, updated some doxy documentation, as well as small changes to the doxyfile itself.

updated doxy file with (i think) optimal config; also removed all comments for easier configuring (if we really need em, we can generate a new file and use it as reference). it's what's being used on http://doxy.samboyer.org/panels2.