Removed unused model's Options.installed.
Removed unused model's Options.installed.

Unused since f9698c43918c118a29516cbef4e23c197eb2dc25.
blighj/django,monetate/django,takis/django,felixxm/django,MarkusH/django,shaib/django,blighj/django,shaib/django,dsanders11/django,pauloxnet/django,apollo13/django,felixxm/django,solarissmoke/django,rsalmaso/django,django/django,django/django,shaib/django,felixxm/django,solarissmoke/django,pauloxnet/django,felixxm/django,auvipy/django,shaib/django,solarissmoke/django,monetate/django,auvipy/django,monetate/django,manhhomienbienthuy/django,apollo13/django,takis/django,django/django,apollo13/django,dsanders11/django,dsanders11/django,pauloxnet/django,MarkusH/django,manhhomienbienthuy/django,takis/django,blighj/django,takis/django,dsanders11/django,manhhomienbienthuy/django,rsalmaso/django,auvipy/django,apollo13/django,rsalmaso/django,MarkusH/django,auvipy/django,solarissmoke/django,pauloxnet/django,manhhomienbienthuy/django,blighj/django,django/django,MarkusH/django,monetate/django,rsalmaso/django