Resolve unknown columns before normalization
Resolve unknown columns before normalization

There's some funny business with not recognizing proper column sort
indexes unless we take care to resolve early.

doganmeh/django-datatable-view,annaproch/django-datatable-view,doganmeh/django-datatable-view,pivotal-energy-solutions/django-datatable-view,greenbender/django-datatable-view,jangeador/django-datatable-view,annaproch/django-datatable-view,addgene/django-datatable-view,pivotal-energy-solutions/django-datatable-view,addgene/django-datatable-view,jangeador/django-datatable-view,doganmeh/django-datatable-view,pivotal-energy-solutions/django-datatable-view,greenbender/django-datatable-view,jangeador/django-datatable-view,greenbender/django-datatable-view,annaproch/django-datatable-view,addgene/django-datatable-view