title: update django database to reflect changes in existing models
body: <p>I've already defined a model and created its associated database via <code>manager.py syncdb</code>. Now that I've added some fields to the model, I tried <code>syncdb</code> again, but no output appears. Upon trying to access these new fields from my templates, I get a "No Such Column" exception, leading me to believe that syncdb didn't actually update the database. What's the right command here?</p>