Add random option for a random sampling (offline part)
Merge branch 'develop' of https://github.com/feelpp/feelpp into develop
remove continuity algorithm in the online part (not set for all models)
Merge branch 'develop' of https://github.com/feelpp/feelpp into develop
Add verification for Newton algorithm initialization : when online WNmu < offline WNmu, index of the nearest neighbor could be out of bound