Merge branch 'develop-variable-chunk-size' into 'master'

Modify the way NFILES is computed

Modify the way NFILES is computed so that it doesn't stop if the user doesn't want to process all the files - Solves issue #17

@dmanubens and @jgarcia, can you check with the experiments that had the problem that we are now OK please?

Thanks

See merge request !9