ENH: Add a logger

[inoelloc]

Currently, smash prints log to stdout and progress bar to stderr (using tqdm). It is not practical, especially as handling is almost non-existent. A good idea would be to use a logger and let the user choose their log level. One point of attention will be to manage Fortran logs, but we'll probably use call-back functions calling Python from Fortran F2PY call-back