Hi,

Enclosed is a patch to limit possible \N'nnn' escapes.  \N transforms 
the number 'nnn' into its character representation and is marked as "for 
backwards compatibility" in mandoc_char(7).

I can only find manuals using this for the double-quote \N'34', so this 
seems safe, but maybe one of you knows of crazy \N usage that would 
inspire me to re-think.  However, throwing, e.g., the \b character in 
there will cause at least -Tps and -Tpdf to puke.

Thoughts?

Kristaps