[ESS] Combining sweave and pdflatex into one helper function

[Dirk Eddelbuettel]

Seb <spluque <at> gmail.com> writes:
> I haven't looked at this particular problem, but I suggested an
> alternative way of working to Dirk (off-list), which he liked (so we're
> 2 at least!), but that requires AUCTeX, so may not appeal to everyone.

In fact I liked it so much that I encouraged Seb to post it here, and I am glad
to see he now did. Given that this about ESS + Sweave (ie LaTeX) I do not think
it is a stretch to assume AUCTeX (ie LaTeX).

I will try to test Vitali's proposal too.  It would be great to have "something"
in base ESS.