Geometry: Update RK refactoring and fix modified flag.

src/Model/Geometry/Reach.py

@@ -967,3 +967,9 @@ class Reach(SQLSubModel):
                 break
 
         return global_index
+
+    def update_rks(self, rks):
+        for rk, profile in zip(rks, self.profiles):
+            profile.rk = rk
+
+        self.modified()