Another big checkin.

This includes some significant cleanups to the new course categories
system.  The basic idea is that the categories/course browser is now
unified under one system, and admin features related to that have
all been moved into the browser (as little icons).

I'm much happier with this as a foundation that can scale and be
built upon.

Still to go:

  - searching
  - paging
  - polishing

Also in here are a lot of little cleanups around the place, such as
the initial setup process.

lib/db/postgres7.sql

@@ -8,6 +8,7 @@ CREATE TABLE prefix_config (
 CREATE TABLE prefix_course (
    id SERIAL PRIMARY KEY,
    category integer NOT NULL default '0',
+   sortorder integer NOT NULL default '0',
    password varchar(50) NOT NULL default '',
    fullname varchar(254) NOT NULL default '',
    shortname varchar(15) NOT NULL default '',
@@ -34,7 +35,7 @@ CREATE TABLE prefix_course_categories (
    description text NOT NULL default '',
    parent integer NOT NULL default '0',
    sortorder integer NOT NULL default '0',
-   courseorder text NOT NULL default '',
+   courseorder integer NOT NULL default '0',
    visible integer NOT NULL default '1',
    timemodified` integer NOT NULL default '0'
 );