don't overwrite scene.__getitem__ for glob-style access to scene objects

It's breaking more complexcases, e.g.

scene["model"].selection=scene["model"].view.Select('aname=CA')

To use the glob-style access, use scene.Match("*")

modules/gfx/pymod/__init__.py

@@ -141,7 +141,7 @@ def FitToScreen(gfx_ent, width=None, height=None, margin=0.01):
   scene.SetRTC(rtc)
 
 
-class GfxNodeListAttrProxy:
+class GfxNodeListAttrProxy(object):
   def __init__(self, node_list, name):
     self._node_list=node_list
     self._name=name
@@ -164,6 +164,11 @@ class GfxNodeListProxy(object):
       return super(GfxNodeListProxy, self).__getattr__(name)
     return GfxNodeListAttrProxy(self._nodes, name)
 
+  def __dir__(self):
+    if len(self._nodes)==0:
+      return dir(None)
+    return dir(self._nodes[0])
+
   def __setattr__(self, name, value):
     if name.startswith('_'):
       super(GfxNodeListProxy, self).__setattr__(name, value)
@@ -183,4 +188,4 @@ def _Match(scene, pattern="*"):
     return matches
   return GfxNodeListProxy(_Recurse("", Scene().root_node, pattern))
 
-SceneSingleton.__getitem__=_Match
+SceneSingleton.Match=_Match