move port back to aircox app

aircox/admin/station.py

@@ -1,15 +1,20 @@
 from django.contrib import admin
 
-from ..models import Station
+from ..models import Port, Station
 from .page import NavItemInline
 
 
-__all__ = ['StationAdmin']
+__all__ = ['PortInline', 'StationAdmin']
+
+
+class PortInline(admin.StackedInline):
+    model = Port
+    extra = 0
 
 
 @admin.register(Station)
 class StationAdmin(admin.ModelAdmin):
     prepopulated_fields = {'slug': ('name',)}
-    inlines = (NavItemInline,)
+    inlines = (PortInline, NavItemInline)