* scribble.ss is gone (ot was doing the running, which run.ss defined)
* converted run.ss to scheme/base
* added private/indirect-renderer which can be used to build renderers
that are based on conversion from the result of an existing
renderer, obviously useful with the latex renderer
* added pdf-render using this and private/run-pdflatex
* added a --pdf option to run.ss
svn: r13946
