Exposing mpi property in PyGriffin class

pygriffin/pygriffin.py

@@ -188,6 +188,10 @@ class PyGriffin:
         cv.check_type('Cross section file', xs, (str, Path))
         self._xs = xs
 
+    @property
+    def mpi_enabled(self):
+        return self.config.mpi_enabled
+
     @property
     def n_procs(self):
         return self._n_procs