Pipelet

Hooks could allow segment writers to code something like:

• seg_libseg_code.py:
  

  hook("preproc")
  #some processing
  ...
  hook("postproc")
  

• seg_libseg_preproc.py:
  

  #some preprocessing code
  ...
  

• seg_libseg_preproc.py:
  

  #some postprocessing code
  ...
  

This would make to write generic libraries of segment quite easy, and replace and extend the current overload_param system.