Make models from 'models' package available under models/ prefix as well

direct/src/p3d/panda3d.pdef

@@ -241,7 +241,10 @@ class models(package):
     # we assume this is the models directory.
     pathname = getModelPath().findFile('cmss12.egg')
     if pathname:
-        dir(pathname.getDirname(), newDir = '')
+        dir(pathname.getDirname(), newDir = 'models')
+
+    # Some people are used to loading the models without models/ prefix.
+    file('models.prc', extract = True, text = "model-path $MODELS_ROOT/models")
 
 
 class fmod(package):