Model: Start export model into SQLite database.

* Study: Create table.
* River: Create node and reach table.
* Geometry: Create table only for profileXYZ and pointXYZ.

src/Model/Network/Node.py

@@ -38,6 +38,15 @@ class Node(object):
     def name(self):
         return self._name
 
+    @property
+    def x(self):
+        return self.pos.x
+
+    @property
+    def y(self):
+        return self.pos.y
+
+
     def setPos(self, x, y):
         self.pos.x = x
         self.pos.y = y