doc/doxygen/refman.tex: remove commands which are no longer valid with recent versions of doxygen (thanks again to Cyril Bordage for the BR)

doc/doxygen/refman.tex

@@ -40,7 +40,6 @@
 \lstset{language=C++,inputencoding=utf8,basicstyle=\footnotesize,breaklines=true,breakatwhitespace=true,tabsize=8,numbers=left }
 \makeindex
 \setcounter{tocdepth}{3}
-\renewcommand{\footrulewidth}{0.4pt}
 \renewcommand{\familydefault}{\sfdefault}
 \hfuzz=15pt
 \setlength{\emergencystretch}{15pt}
@@ -85,10 +84,8 @@ Documentation License”.
 \end{quote}
 \end{figure}
 
-\clearemptydoublepage
 \pagenumbering{roman}
 \tableofcontents
-\clearemptydoublepage
 \pagenumbering{arabic}
 \hypersetup{pageanchor=true,citecolor=blue}