added hook for modifying the filter choices
added hook for modifying the filter choices

soybackend/django-model-report,soybackend/django-model-report,edos21/django-model-report,soybackend/django-model-report,edos21/django-model-report,edos21/django-model-report,soybackend/django-model-report,edos21/django-model-report