PythonWrapper was no more building on windows due to a too long
link command line.
A temporary fix was made. But on long term the wrapper must be refactored
into submodules to allow to more easily add new functions.
Added a new header of vectorial inline functions for Neon and Helium.
This header is used in the implementation of some functions.
Corrected used of float (float functions rather than double ones).
Christophe Favergeon