Skinning optimizations: order vertices by weight groups, compute mesh

space bone transforms only once per mesh per bone (rather than each time 
the bone appears in a weight group), low level fiddling.  Also changed 
the exporters to export everything, regardless of what's selected.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4081 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/jme/model/Model.java

@@ -329,6 +329,7 @@ public class Model extends ModelNode
         for (int ii = 0; ii < anim.transformTargets.length; ii++) {
             oxforms[ii].apply(anim.transformTargets[ii]);
         }
+        updateWorldData(0f);
     }
     
     /**