Script to check notebooks: remove the she-bang and add two arguments to...

Script to check notebooks: remove the she-bang and add two arguments to circumvent an issue with UTF 8 encoding (fix suggested there: https://www.journaldunet.fr/web-tech/developpement/1441055-corriger-l-erreur-unicodedecodeerror-utf-8-codec-can-t-decode-byte-0xff-in-position-0-invalid-start-byte/).