Sediment: Add SL to geometry into DB and minor change.

src/Model/Geometry/PointXYZ.py

@@ -44,7 +44,9 @@ class PointXYZ(Point, SQLSubModel):
             y INTEGER NOT NULL,
             z INTEGER NOT NULL,
             profile INTEGER NOT NULL,
-            FOREIGN KEY(profile) REFERENCES profileXYZ(id)
+            sl INTEGER,
+            FOREIGN KEY(profile) REFERENCES profileXYZ(id),
+            FOREIGN KEY(sl) REFERENCES sedimentary_layer(id)
           )
         """)