code: def get(self, key, fallback=None):
          
          value = None
          if key in self._config:
              value = self._config[key]
              if isinstance(value, Section):
                  value = None
          if value is None:
              value = fallback
          return value
docs: look up global config values from alot's config
  
          :param key: key to look up
          :type key: str
          :param fallback: fallback returned if key is not present
          :type fallback: str
          :returns: config value with type as specified in the spec-file