this involves moving all formslib includes to where they're actually needed.
it also moves the portfolio stuff from assignment,data,chat,forum and glossary
into a locallib.php which involved creating it for many of those modules.
Added much needed documentation to the portfolio "scripts" (the libs are all
fine), and moved all parameter fetching from the body of the file to the top.
this introduces portfolio/file.php to serve portfolio related files - access check is delegated to the plugin.
and also two new classes in the portfolio plugin tree - push vs pull.
