Add 'cloner'. Example also uses concrete syntax for LHS and RHS. Renders all possible rewrites and morphisms with LHS and RHS.

transformation/cloner.py

@@ -0,0 +1,8 @@
+from uuid import UUID
+from concrete_syntax.textual_od import parser, renderer
+
+# Clones an object diagram
+def clone_od(state, m: UUID, mm: UUID):
+    # cheap-ass implementation: render and parse
+    cs = renderer.render_od(state, m, mm, hide_names=False)
+    return parser.parse_od(state, cs, mm)