Added support for sqla association proxy in model view.

allow user to set  flag "ignore_hidden"

Fix geoa.GeoJSONField

support for WTForms >= 3.0

Updated hybrid property detection to new sqlalchemy API

Modified hybrid property example to make use of the scaffold mechanism to create filters.

support multiple column sort with column_sortable_list

Update actions.js

Fix url generation with localized named filters.

Create function to toggle row checkbox if all checkboxes were toggled manually

Support single table inheritance for inline models (sqla)

Enable support for after_model_ actions in appengine

Support form_args for appengine

This is needed for export function to work

Coremabu