SL: Model add basic command for SL and fix DB save artifact.

src/Model/SedimentLayer/SedimentLayer.py

@@ -180,7 +180,56 @@ class SedimentLayer(SQLSubModel):
         for l in self._layers:
             data["ind"] = ind
             l._sql_save(execute, data)
-
             ind += 1
 
         return True
+
+    def get(self, index):
+        return self._layers[index]
+
+    def set(self, index, new):
+        self._layers[index] = new
+        self._status.modified()
+
+    def insert(self, index, new):
+        self._layers.insert(index, new)
+        self._status.modified()
+
+    def new(self, index):
+        n = Layer(status = self._status)
+        self.insert(index, n)
+        self._status.modified()
+        return n
+
+    def delete(self, els):
+        for el in els:
+            self._layers.remove(el)
+        self._status.modified()
+
+    def delete_i(self, indexes):
+        els = list(
+            map(
+                lambda x: x[1],
+                filter(
+                    lambda x: x[0] in indexes,
+                    enumerate(self._layers)
+                )
+            )
+        )
+        self.delete(els)
+
+    def move_up(self, index):
+        if index < len(self._layers):
+            next = index - 1
+
+            l = self._layers
+            l[index], l[next] = l[next], l[index]
+            self._status.modified()
+
+    def move_down(self, index):
+        if index >= 0:
+            prev = index + 1
+
+            l = self._layers
+            l[index], l[prev] = l[prev], l[index]
+            self._status.modified()

src/Model/SedimentLayer/SedimentLayerList.py

@@ -37,6 +37,10 @@ class SedimentLayerList(SQLSubModel):
     def _sql_save(self, execute, data = None):
         ok = True
 
+        # Delete previous data
+        execute("DELETE FROM sedimentary_layer")
+        execute("DELETE FROM sedimentary_layer_layer")
+
         for sl in self._sl:
             ok &= sl._sql_save(execute, data)