#668 Reference properties are not updatable

[Kirill Fedoseev]

I'm not sure if it is bug or feature request, but all elements of prop_map_put are created with pythoncom.DISPATCH_PROPERTYPUT flag in genpy.py
Some properties have reference type and flag should be DISPATCH_PROPERTYPUTREF.

For instance, SendUsingAccount cannot be updated in usual way, I have to make call of oleobj.Invoke(...) function to update the property.