fix: adding set item for fold frame to change

the feature representing a coordinate

LoopStructural/modelling/features/structural_frame.py

@@ -28,7 +28,20 @@ def __init__(self, name, features, fold=None):
         self.fold = fold
         self.builder = None
 
-    def __getitem__(self, item):
+    def __getitem__(self, key):
+        """
+
+        Parameters
+        ----------
+        key index of feature to access
+
+        Returns
+        -------
+        the structural frame geological feature
+        """
+        return self.features[key]
+
+    def __setitem__(self, key, value):
         """
 
         Parameters
@@ -39,7 +52,7 @@ def __getitem__(self, item):
         -------
         the structural frame geological feature
         """
-        return self.features[item]
+        self.features[key] = value
 
     def set_model(self, model):
         """Link the model that created the frame to the frame

LoopStructural/modelling/fold/fold_rotation_angle.py

@@ -12,9 +12,6 @@
 
 
 class FoldRotationAngle:
-    """
-
-    """
     def __init__(self, rotation_angle, fold_frame_coordinate, svario=False):
         """