add clearcache command

src/c3nav/mapdata/management/commands/clearcache.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')

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

@@ -1,14 +0,0 @@
-from django.core.management.base import BaseCommand
-
-from c3nav.mapdata.render import render_all_levels
-
-
-class Command(BaseCommand):
-    help = 'render the map'
-
-    def add_arguments(self, parser):
-        parser.add_argument('--show-accessibles', action='store_const', const=True, default=False,
-                            help='highlight graph building areas (for debugging, but it looks nice, too)')
-
-    def handle(self, *args, **options):
-        render_all_levels(show_accessibles=options['show_accessibles'])