Dev py espresso

Hi @cvazquez, @adudziak, this merge contains the following updates:

-Handling Espresso GLM models into B2DXFitters time fits

-Improve the building of matrix (for gaussian constraints, resampling etc...)

-Add a "cheated" (toy) tagger in the MC (more robust way to check tagging compared to naive "true" tagging)

-Add script to compare multi-dimensional measurements ("à-la-HFLAV")

-Config files, submission scripts etc...