Ref Man for my contribution

I'll be happy if this could be proofread before I merge ...
I think `{\tt -Q}` is what you use if you're writing plain TeX, `\texttt{-Q}` is what you use if you're writing LaTeX.

Similarly, you want `\emph{directory}` or `\textit{directory}`, not `{\em directory}` nor `{\it directory}`.