Add varchar to prevent unsupported filter error

Notice a get_count_query necessity in the docstring

This wont let me to revert #45a27235

upload.py: more fixes for py3

fix #564: check if parent id is already here

Use proper class in super call

form.upload: folder needs exec permission

Added translation to portuguese (pt)

Extension point to customize the behaviour of inaccessible views.

Add example of 12-hour time to documentation and fix formatting mistake

add varchar to is_text_column_type

It maintain the default behaviour (403 error) and give a way to
enhance this behaviour. E.g. redirect anonymous users to a login page.

Add documentation about enabling CSRF validation

Allow Changing DateTimeField's date-format using form__widget_args

Allow Changing DateTimeField's date-format using form_args