Work on native gui: list views for objects; set version to 0.2.2

yms/model/vessel.py

@@ -36,9 +36,10 @@ class Vessel(DbRecord):
         self._insert()
         self.conn.commit()
 
-    def save(self):
+    def save(self, commit=True):
         super().save()
-        self.conn.commit()
+        if commit:
+            self.conn.commit()
 
     def delete(self):
         # there must be no assiciated data!