Changes since 0.5.17:
- fix for yEnc files in UUInfoFile
- patch by Matthew Mueller:
- add CRC generation and checks for yEnc
- accept yEnc files where the tab character is not escaped
- improved error checking for yEnc files
Autoclear -- remove files after they have been decoded.
Autorename -- rename output files if they already exist.
Stricter MIME compatibility, and bugfixes.