Adding top level pages for doxygen generated content
Removed deprecated settings from doxygen file
Getting rid of content generated from readmes
Added some interesting build targets to docs
Added libraries and program categories; stubs for cogserver and cogutil
Covering some parts of the cogutil in doxydocs; reformatted cluster.h & .c to make description visible to doxygen
Added custom header, footer and css to doxygen
Other parts of the cogutil documented
lazy selector to documentation
Merged changes from previous pull requests
Merge pull request #264 from TNick/doxydoc

Doxygen generated documentation

DHart is our doxygen master, and perhaps in the future he should review these pull requests.  I don't know how to get git to auto-notify dhart about this message.