HOWTO modify the documentation
------------------------------

 1. To modify the API ref, just modify the docstrings in the code
 2. To modify the Programing guide, modify the files located in docgen/programming_guide
 3. See some hints in the documentation, in the section Dev

Bezier path builder
-------------------

Run:
 $ python path_draw.py foo.py
 
 press '0','1','2' + ENTER you can switch to different paths.

 press 'n' to create a new path
 press 's' to save your changes to the foo.py file

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