Add a flowchart environnement and its listof

So we can more easily access those flowcharts from pdf and website,
rather than looking in the crowded list of figures.

book/troubleshooting/misc.tex

@@ -320,14 +320,14 @@ and convert it into acetic acid. Acetic acid has a very pungent smell.
 When tasting acetic acid, the flavor of your bread is often perceived
 as quite strong.
 
-\begin{figure}[!htb]
+\begin{flowchart}[!htb]
 \begin{center}
   \input{figures/fig-ethanol-oxidation.tex}
   \caption[acetic acid creation]{Oxygen is required to create acetic
       acid~\cite{acetic+acid+production}.}%
   \label{fig:ethanol-oxidation}
 \end{center}
-\end{figure}
+\end{flowchart}
 
 This is nothing bad. But if you would like to change
 the flavor of your final bread, consider converting