* In PostTrainLinearQuantizer - moved 'clip_acts' and 'clip_n_stds'
  to overrides, removed 'no_clip_layers' parameter from __init__
* The 'no_clip_layers' command line argument REMAINS, handled in 
  PostTrainLinearQuantizer.from_args()
* Removed old code from comments, fixed warnings in 
  test_post_train_quant.py
* Updated tests
* Update post-train quant sample YAML