Name change diff->get-diff

Author: Sparks29032

src/diffpy/morph/morphpy.py

@@ -45,6 +45,7 @@ def __get_morph_opts__(parser, scale, stretch, smear, plot, **kwargs):
         "apply",
         "reverse",
         "diff",
+        "get-diff",
     ]
     opts_to_ignore = ["multiple-morphs", "multiple-targets"]
     for opt in opts_storing_values:

tests/test_morphpy.py

@@ -75,7 +75,7 @@ def test_morph_opts(self, setup_morph):
             "addpearson": False,
             "apply": False,
             "reverse": False,
-            "diff": False,
+            "get_diff": False,
             "multiple_morphs": False,
             "multiple_targets": False,
         }