Apache Forrest code fix (bug FOR-146)

code fix by DC (fixes bug FOR-146) : Moved all references to //skinconfig out of the document2html.xsl into the site2xhtml.xsl file. * Rationalized the Table of Contents stuff by creating a "toc" mode in the common/xslt/html/document2html.xsl. That is then used to generate the per-page ToC and the ToC attached to the menu. * Removed extraneous default xsl matchers on the non-common document2html and site2xhtml XSLs. This allows matches defined in the imported transformation sheets to match (imported sheets have lower precedence). * Defined a couple of
place holder tags used by the document2html. Those are then skinned by the site2xhtml sheets. * Note: If you have your own skins that were referencing "$config" or "//skinconfig" in the document2html.xsl then you need to make similar changes. * For more information see the FOR-146 issue report. Thanks to Rick Tessner.