Add FFT versions under Numpy and GPyFFT
Minor changes.
Change name of C implementation of DFT.
Add C sequential and OpenMP version of DFT
Correction in MyDFT under CUDA
Add extension version for metrologie.
Freeing memories reserved on devices. Cosmetic Changes.
New elements.
Minor changes about inhibition of naive method.
Add modified version of solution for DFT implementation.
Add example with simple DFT implementation
Add steps for Practical work in ETSN
Add first solutions of ETSN school.
Add Practical Work for ETSN summer school.