Wrote a tool to verify that convertdb.py does what it's supposed to.
Added a todo comment to Scheduler about threading and generators.
Updated INSTALL documentation about eventual Postgres requirement.
* changed controller.Users and controller.Root constructor arguments to support this.
* Updated INSTALL document accordingly.
* Client now will prepend this new http_url variable to the logout link.
* both tools/initdb.py and tools/updatedb.py set link ids appropriately, rather than just leaving them all as "new"
* both tools/initdb.py and tools/updatedb.py set certain links to use https if configured as such in config/Common.py
* tools/initdb.py no longer creates a default "witten" user
* Added target="_top" to links that should replace the top-level window, and updated client code to ignore links with targets.
* Removed form_base_url from Editor.js, as https URL is now tacked on by initdb.py/updatedb.py instead.
Dan Helfman