message: deprecate WindowData layer type
diff: @@ -16,7 +16,8 @@ namespace caffe {
  /**
  * @brief Provides data to the Net from windows of images files, specified
  - * by a window data file.
  + * by a window data file. This layer is *DEPRECATED* and only kept for
  + * archival purposes for use by the original R-CNN.
  *
  * TODO(dox): thorough documentation for Forward and proto params.
  */
  