Refactor default_order.

[hobbestigrou]

Merge order_by_list and default_order.

[benoitbryon]

Missing tests around order reverse (perhaps another story): as an example default_order = '-last_name'.

[benoitbryon]

Missing tests when order_by is passed in request (request.GET['order_by'] is not empty).

[benoitbryon]

Former order_by_list was a list, whereas default_order is a string... Was the "list" feature important? Perhaps not.

[benoitbryon]

Missing notes in CHANGELOG.
Missing deprecation warnings too? (is it covered by deprecation policy?)

[hobbestigrou]

I'll make a ticket for default_order can make a list or a string and remove order_reverse.

[Natim]

Then how do you manage the order arrow?

[benoitbryon]

Have you checked the demo project? Does it explain the usage of default_order?

[boblefrag]

and form is invalid