* Update the Doxyfile for 1.7.6.1. Doxywizard reformatted the comments; that's why this change is so big
* Disable graph inheritance trees; use "Inherits/Inherited by" lists instead (Doxygen has this on by default; I don't think it was intentional)
* Shorten two subgroup names; helps with formatting in Doxygen 1.8 and looks cleaner
* Moves the page footer ("The Haiku Book pre-R1...") be in a <footer> tag, and add a CSS rule for this tag
* Disable XML output, no one is using it
* Disable Microsoft IDL parsing, speeds up Doxygen a bit
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