docs: def configure(config={}, datastore=None, nested=False):
      """
      Useful for when you need to control Switchboard's setup
      """
      if nested:
          config = nested_config(config)
      # Re-read settings to make sure we have everything.
      # XXX It would be really nice if we didn't need to do this.
      Settings.init(**config)
  
      if datastore:
          Switch.ds = datastore
  
      # Register the builtins
      __import__('switchboard.builtins')