SL: Add reach SL edition window.

src/Model/Geometry/Profile.py

@@ -34,6 +34,7 @@ class Profile(object):
         self._kp = float(kp)
         self._name = str(name)
         self._reach = reach
+        self._sl = None
 
         self._points: List[Point] = []
 
@@ -120,6 +121,19 @@ class Profile(object):
         self._name = value.strip()
         self._status.modified()
 
+    @property
+    def sl(self):
+        """
+        Returns:
+            Profile sediment layers.
+        """
+        return self._sl
+
+    @sl.setter
+    def sl(self, value: str):
+        self._sl = value
+        self._status.modified()
+
     @property
     def profile_type(self):
         """