update a large number of textproc ports
update twig
fixup some properties.
Add docbook-xml-450. Change the docbook metaport so that it uses options and no longer installs a catalog file. Instead each port is responsible for adding itself. That means the exec and unexec comands must be right in the plists for xmlcatmgr!
Fake fix.
added docbook meta port and linux documentation sgml