Implementation of the hybrid data

Hi Noel,

Can you push this to your repository ?

I've implemented the hybrid data in the get_channel_array method. I used the get_field_hist method of the sample class to get the histogram template and the FindBin method to get the bin indices defining the range we need to replace. 
In case of the uniform binning, I replaced the bin indices by their equivalent in term of uniform binning by using again the FindBin method on the uniform hist this time.

Thanks !
Quentin