Sun Oct 3 11:49:47 CEST 2010

Finishing the RV formatter

I broke it off abrubtly half a year ago so I have a bit of trouble to
know what was actually done.  It seems that the formatting didn't work
yet, so let's build that first.

Can the formatting be shared between old and new code?  The file
render-ramblings.ss only uses node query, not storage, so that should

  * abstract a node as a finite function.

  * abstract toc access (prev/next) as function