Added Doxygen docs

docs/latex/files.tex

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+\doxysection{File List}
+Here is a list of all documented files with brief descriptions\+:\begin{DoxyCompactList}
+\item\contentsline{section}{Exponential/\mbox{\hyperlink{_exponential_8h_source}{Exponential.\+h}} }{\pageref{_exponential_8h_source}}{}
+\end{DoxyCompactList}