Simplified model's Options.add_field() a bit.
Simplified model's Options.add_field() a bit.

claudep/django,adamchainz/django,koordinates/django,adamchainz/django,blighj/django,blighj/django,koordinates/django,takis/django,rsalmaso/django,pauloxnet/django,pauloxnet/django,elena/django,googleinterns/django,django/django,ghickman/django,ghickman/django,takis/django,atul-bhouraskar/django,pauloxnet/django,MarkusH/django,shaib/django,solarissmoke/django,atul-bhouraskar/django,wkschwartz/django,rsalmaso/django,dsanders11/django,felixxm/django,freakboy3742/django,claudep/django,elena/django,elena/django,MarkusH/django,manhhomienbienthuy/django,adamchainz/django,koordinates/django,solarissmoke/django,adamchainz/django,django/django,simonw/django,manhhomienbienthuy/django,pauloxnet/django,solarissmoke/django,kaedroho/django,theo-l/django,shaib/django,django/django,elena/django,koordinates/django,dsanders11/django,kaedroho/django,googleinterns/django,manhhomienbienthuy/django,monetate/django,apollo13/django,freakboy3742/django,atul-bhouraskar/django,apollo13/django,atul-bhouraskar/django,auvipy/django,auvipy/django,django/django,MarkusH/django,kaedroho/django,rsalmaso/django,apollo13/django,ghickman/django,freakboy3742/django,simonw/django,manhhomienbienthuy/django,simonw/django,shaib/django,theo-l/django,felixxm/django,theo-l/django,dsanders11/django,takis/django,wkschwartz/django,solarissmoke/django,ghickman/django,shaib/django,theo-l/django,blighj/django,felixxm/django,takis/django,wkschwartz/django,blighj/django,wkschwartz/django,MarkusH/django,googleinterns/django,monetate/django,claudep/django,monetate/django,apollo13/django,rsalmaso/django,monetate/django,simonw/django,claudep/django,dsanders11/django,felixxm/django,googleinterns/django,auvipy/django,auvipy/django