JFC-MC

@pkittenis Cool, thanks! We're going to try it out on the next week. @brutasse Is there any chances for these commits to be incorporated to the master or somehow else...

Good news! It seems netascii transfer mode(RFC 764 as it's stated on the https://en.wikipedia.org/wiki/Trivial_File_Transfer_Protocol) is already implemented in another python-based tftp server. So I guess it can be easily integrated...