Inherit aspirin &c from nenyalib; add flexgroup repo.

Also bumped to as3isolib FP10 since I don't feel like hosting FP9 and FP10.

aslib/src/main/as/com/threerings/miso/client/PrioritizedSceneLayoutRenderer.as

@@ -127,6 +127,13 @@ public class PrioritizedSceneLayoutRenderer
         //trace("scene layout render time", getTimer() - startTime, "ms (manual sort)");
     }
 
+    /** Not used. */
+    public function get collisionDetection () :Function {
+        return null;
+    }
+    public function set collisionDetection (fn :Function) :void {
+    }
+
     /**
      * Adds the front-to-back dependency to our map of all such dependencies.
      */
@@ -173,4 +180,4 @@ public class PrioritizedSceneLayoutRenderer
      * the objects that should be rendered behind (and therefore before) it. */
     protected var _dependencies :Dictionary;
 }
-}
+}