better error handling of import errors in CGI, and split PageTree out from page.py into page_tree.py and tree_parse.py
#extends layout
#def page_content
<h1>Oops! Not Found</h1>
<p>The page you requested does not seem to exist. Perhaps you can find what you're looking for in the menu at the left?</p>
<pre>
Requested Path: $page_path
</pre>
#end def