Django-listing

--------------------
- Filters form now accept virtual fields (django annotate)

--------------------
- Add resolve_qs_value filter attribute
- Fix filters form with multi-selection selects

--------------------
- Add support for a specific attached form mass op clean method

--------------------
- Improve django-listing events

--------------------
- Fix Listing.get_view()
- Fix attached-form enter press event that trigger bad button

--------------------
- Trigger some more events to catch before/after post/file generation moment
- Use HtmlAttributes in listing container and attached form buttons