Django-convenient-formsets

- The server side formsets and the corresponding client side plugin now
has support for ordering of forms.

On the client side, this can be enabled by setting the `canOrderForms`
setting, together with the CSS selectors for clickable HTML elements to
move forms up and down.

On the server side, both the existing `ordering_widget` and the upcoming
`deletion_widget` (from Django 4.0) have been backported to earlier
versions. The `delete_widget` attribute has been renamed accordingly.

- The configuration of the client side plugin has been revised. The new
parameters `canAddForms` (default: true) and `canDeleteForms` (default:
false) must now be used to enable or disable functionality.
- Upon initialization, the plugin now also performs more checks on the
presence of required DOM elements. This allows developers to catch
configuration errors quickly.
- When `DEBUG` is set to False, the minified version of the JavaScript
code is now loaded in order to reduce file size.

- Exclude tests when packaging

- Fix packaging configuration

- Initial Beta version