completely rewrite map renderer

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

@@ -0,0 +1,10 @@
+from django.core.management.base import BaseCommand
+
+from c3nav.mapdata.render import render_all_levels
+
+
+class Command(BaseCommand):
+    help = 'render the map'
+
+    def handle(self, *args, **options):
+        render_all_levels()