|Release 22 contains the following bug fixes
- correction of the substraction bug pointed out by Ingo Hohmann
- better compile time errors positions (once more)
- redesigned SMTP and POP3 clients for better handling of the mailing list,
Since the SMTP client was buggy, nobody received the release 22
availability notification, so I had to make a release 23.
If you don't care of SMTP and POP3 clients, there is no use to update
from release 22 to release 23.