Fix broken documentation in presence of \zeroone{... \tt ...}.

The way \zeroone was defined, the \tt modifier was leaked outside the
brackets, thus messing with the following text. There are a bunch of
occurrences of this issue in the manual, so rather than turning all the
\tt into \texttt, the definition of \zeroone is made more robust.

Unfortunately, there is one single occurrence of \zeroone that does not
support the more robust version. (Note that this specific usage of
\zeroone is morally a bug, since it goes against all the LaTeX
conventions.) So the commit also keeps the old leaky version of \zeroone
around as \zeroonelax so that it can be used there.

0 files changed, 0 insertions, 0 deletions