Apache Forrest code update

code update
by
JT
:

Created new document-v12 DTD module, containing all DTD improvements
made since 0.4 was released, and use it to define new v12 versions of
all DTDs (document, howto, faq, etc). The doc-v12 DTD removes many
restrictions in the DTD that were found to be unnecessary, and is closer
to the HTML content model. A list of changes can be found in the doc-v12 sample page.