Added IT System count to PlatformAdmin list_display.
Added IT System count to PlatformAdmin list_display.

rockychen-dpaw/oim-cms,parksandwildlife/oim-cms,scottp-dpaw/oim-cms,scottp-dpaw/oim-cms,parksandwildlife/oim-cms,parksandwildlife/oim-cms,scottp-dpaw/oim-cms,rockychen-dpaw/oim-cms,rockychen-dpaw/oim-cms