rebuild altitudes and level geoms on mapupdate

src/c3nav/mapdata/management/commands/clearmapcache.py

@@ -0,0 +1,9 @@
+from django.core.management.base import BaseCommand
+
+
+class Command(BaseCommand):
+    help = 'clear the mapdata cache'
+
+    def handle(self, *args, **options):
+        from c3nav.mapdata.models import MapUpdate
+        MapUpdate.objects.create(type='management')