[fix #6] also take client side default values into account

for reach digitizing in wizard
take first client default values then provider default values

tools/qgepmaptooladdfeature.py

@@ -40,7 +40,8 @@
     QgsTolerance,
     QgsFeatureRequest,
     QGis,
-    QgsGeometry
+    QgsGeometry,
+    NULL
 )
 from PyQt4.QtGui import (
     QCursor,
@@ -231,7 +232,12 @@ def rightClicked(self, _):
         fields = self.layer.fields()
         f = QgsFeature(fields)
         for idx in range(len(fields)):
-            f.setAttribute(idx, self.layer.dataProvider().defaultValue(idx))
+            # try client side default value first
+            v = self.layer.defaultValue( idx, f )
+            if v != NULL:
+                f.setAttribute(idx, v)
+            else:
+                f.setAttribute(idx, self.layer.dataProvider().defaultValue(idx))
 
         f.setGeometry(self.rubberband.asGeometry())