[racket] Scribble secref unlinked in PDF output

I've change Scribble to hyperlink section references by default in
LaTeX/PDF output.

The change turned out to be easy, due to improvements back in July that
deliver a LaTeX-level label to macros that render section links (when
the referenced section is within the same document).

At Wed, 23 Oct 2013 23:02:27 +0100, Tim Jervis wrote:
> Dear Racket Users,
> 
> I have been writing a document in Scribble, without output to PDF. The table 
> of contents of the PDF nicely links the entries in the table to the sections 
> in the document, so that when viewing the PDF on screen rather than paper, one 
> can click or tap on a line in the table of contents to quickly navigate to the 
> relevant section. Unfortunately, if I add a secref element in the body of the 
> document, it is not rendered in the same way and the secref elements are not 
> clickable on screen.
> 
> My investigation into this so far has revealed to me that the table of 
> contents linking appears to be handled with the LaTeX Hyperref package, and is 
> taken out of Scribble's hands.
> 
> For HTML output, Scribble seems able to render links just fine. I wonder if 
> Scribble has been written without the notion that PDF output might be viewed 
> on screen, so the link elements have been neglected.
> 
> In any event, is there a way to render a PDF with "live" secref links, to give 
> similar functionality to the table of contents?
> 
> Kind regards,
> 
> 
> 
> Tim
> 
> Tim Jervis
> 
> http://timjervis.com/
> 
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