[PATCH: scrnsaverproto] Fix id attributes, linkend and olinks

[Matt Dew]

<snip>

> Are you considering adding "xrefstyle" with pageabbrev to all xref links?
> If so, consider this suggestion to put it in the customization layer.
> http://lists.oasis-open.org/archives/docbook-apps/200405/msg00121.html
> This attribute was meant to override the default in a few instances.
>
> Consider that we might want to change the xrefstyle at later point in time

After looking into it some more and thinking about it, here's what I'm 
thinking.

External links = olink
internal links = xref

xrefs and olinks,  there's a docbook 5 path. It requires some sed-lovin' 
no matter what we do.

I like that we can style xrefs. Should we, at some point in the future, 
decide xref is a pain and we'd prefer link,  it's sed-able. No great pain.

If no objections, this is the path I'm going,
Matt