[rebber] Caption of code (and image) needs protection for comma and square brackets.

A (not so) funny unexpected issue arise when there is a comma in the legend of codes.

If #275 is fixed, then the following code

```c
int main() {
  return 0;
}
```
Code: un truc, comme ça

Generates

\begin{CodeBlock}[un truc, comme ça]{c}
int main() {
  return 0;
}
\end{CodeBlock}

while, to avoid issue, it should generates a “protection” for any comma in the caption:

\begin{CodeBlock}[un truc\protect{,} comme ça]{c}
int main() {
  return 0;
}
\end{CodeBlock}

… Otherwise LaTeX thinks it is another option, and fails. It is normally limited to code captions (not table and figures, normally), but if it is easier for you, \protect{,} is harmless, so it would work in any caption.

[pierre-24]

Quotation works differently (like the attention or info box, actually), and do not use a floating environment (thus no \captionof). We could do it, though, but would it make sense to give a caption to a quotation ? (especially since it would render like “Quotation 26 – The author of that quotation”).

[vhf]

Deployed.