docs: def setup(self, app):
          '''
          Make sure that other installed plugins don't affect the same keyword argument.
          '''
          for other in app.plugins:
              if not isinstance(other, MySQLPlugin):
                  continue
              if other.keyword == self.keyword:
                  raise PluginError("Found another mysql plugin with conflicting settings (non-unique keyword).")
              elif other.name == self.name:
                  self.name += '_%s' % self.keyword