LaTeX version requirement

Hello,

Following up on the discussion on supporting tagging for LaTeX output, I
think that it could be good if we decided something on the LaTeX versions
we support.

I think that we need to support the most recent LaTeX releases.  My
proposal would be that requirement to be the only one for texi2any generated
LaTeX.  In most cases, the output would also be compatible with older
releases, but it may depend.  Then, if we know, we could put in the NEWS
the characteristics of the LaTeX version we depend on.

Thoughts?

-- 
Pat