Add desc as a function parameter to sort_url

on_form_prefill() should be executed when form validation fail.

Fix bad call `super()` in `BaseSQLAFilter.apply`

Added sorting, labeling and visibility configuration to file admin columns

Extract a method for calculating inline model keys

Support association proxies in path when determining hybrid property

1) Added support for dealing with association proxies when determining if field path is a hybrid property.
2) Restored support for filters using column values (not just their names).

Fixes #1339 and adds python 3 support to the example

Fix CSRF for production deployments

Added support for remote hybrid properties filters

To provide a way to custom the inline model keys
in the case of two same inline model class.

Fix #1347

Current SecureForm implementation generates CSRF secret using
`os.urandom()` every time when application start up. CSRF secret is used
to calculate csrf_token check value, so if someone would use a command
similar to

    gunicorn --workers=8 app

to run his flask-admin app on production then most form submissions
would silently fail (silently - as for now, it is probably another one
bug).

Instead of custom `os.urandom()` logic the `app.secret_key` value should
be used to produce CSRF token values.

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