added CategoryNode.get_basic_nodespace_cat_tree_info.  added js includes in outer_wrapper for jquery and cytoscape stuff.  added stubs for a bunch of page classes in the web layer, as well as a working but rudimentary category tree display page (and conveniently forgetting that i ever considered serving static content via web.py).
graph and comment template initial commit
asking browser not to send referer header.  experimenting with graph layout settings.  added some methods for rendering graph query results as python dictionaries.  added queries for category tree and category tree plus writeups.  slight refactoring of category_list page.  added some TODOs.