Work around Tex Live 2012 versus doxygen problem.
TeX Live 2012 seems to dislike files produces by doxygen (1.8.x.y).
In particular, makeindex(1) program creates invalid index entries like
\hyperpage{NNN_}
(note the trailing underscore in the page number). This breaks automatic
builds and is very annoying. This patch works around the problem by
post-processing the generated *.ind file. This hack is a bit crude, however
it gets the job done (a proper fix is welcome, though).
- [DH] doc/reference/Makefile.am