docs: def load_stencil_set(self, stencilset_name):
          """Return the Stencil Set from this template pack."""
          if stencilset_name not in self._stencil_sets:
              if stencilset_name not in self.manifest['stencil_sets'].keys():
                  raise exc.FastfoodStencilSetNotListed(
                      "Stencil set '%s' not listed in %s under stencil_sets."
                      % (stencilset_name, self.manifest_path))
              stencil_path = os.path.join(
                  self.path, 'stencils', stencilset_name)
              self._stencil_sets[stencilset_name] = (
                  stencil_module.StencilSet(stencil_path))
          return self._stencil_sets[stencilset_name]