limit_choices_to - utils function 'lookup_dict_from_url_params' to convert url GET to ORM filter a queryset.
Add a tests/regressiontests dir to host standalone test ;
tests/runtests.py autodiscover and run tests in regressiontests ;
django_yaaac is made import-able outside the context of a django project (like for the tests) ;
Unit test of lookup_dict_from_url_params.