* specify the algo preceded by a dash such as -algo
  with algo=[sha sha1 sha224 sha256 sha384 sha512 md5]

* specify the path to a folder or a file
    - if file: create key file at dest_path (=path by default)
    - if folder: go through all sub-directories and create key files at
      dest_path (=path by default) based on sub-directory architecture

/!\ WARNING /!\ : Won't work has expected if a directory contains dot!
  -> Because we identify a file if it contains dot for now

See https://github.com/MayeulChassagnard/BashScripting/blob/master/bash/convertToKeyFile.sh


Signed-off-by: Mayeul Chassagnard <mayeul.chassagnard@kitware.com>