changed markers.js to output one marker per line

this has been requested *many* times, because it makes it easier to
(1) learn what format markers.js uses, and
(2) write shell scripts that process markers.js.

It shouldn't break existing processors that use json loaders, and does
not drastically increase file size (just one extra byte per ~70).

googlemap.py

@@ -144,7 +144,13 @@ class MapGen(object):
 
         # write out the default marker table
         with open(os.path.join(self.destdir, "markers.js"), 'w') as output:
-            output.write("var markerData=%s" % json.dumps(self.world.POI))
+            output.write("var markerData=[\n")
+            for marker in self.world.POI:
+                output.write(json.dumps(marker))
+                if marker != self.world.POI[-1]:
+                    output.write(",")
+                output.write("\n")
+            output.write("]\n")
         
         # save persistent data
         self.world.persistentData['POI'] = self.world.POI