[GRASS5] suggestion and example for GRASS 5.1 manual pages

Hi,

to illustrate how easy existing HTML pages can be enhanced by adding
formula (a wish form Helena), I have added a file:

  grass51/vector/v.surf.rst/v.surf.rst.dox

With doxygen installed, you can run
  cd vector/v.surf.rst/
  make man

and you'll receive in that directory:
  doxygenhtml/index.html

which contains the well known HTML page plus a new
appendix with some formula (originally written in Latex
inside v.surf.rst.dox).

This looks promising, as various output formats can be
generated with doxygen (HTML, Latex, PDF, PS, ...)

Cheers

Markus