Version 3.22
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1. Fixed a crash in the following obscure circumstances: A system filter obeyed
a "mail" command, then then froze the message. The message created by the
"mail" command could not be passed to a nested Exim for some reason (e.g.
system ran out of process ids). The failure to send the message was logged, but
then the original Exim crashed.

2. Fixed a bug in the libident library (not my bug!). If a very long response
was received, it could overrun the buffer by one byte.

3. There was no explicit checking for the length of message created for
log_ip_options when a call with IP options was received. However, the length of
the option string is limited to 40 on the systems I've looked at, so there
wasn't a real problem. Nevertheless, I have added some paranoid length
checking, just in case.

4. Change 10 of 3.166 introduced a bug; it continued trying to verify when the
child was a pipe, file, or autoreply. This could cause crashes.

5. Added server_mail_auth_condition to authenticators.

6. xtext decoding for AUTH on MAIL commands wasn't adding a terminating zero.

7. There was a bug in the table for decoding data encoded in base 64
(authentication data). '/' was being turned into 73 instead of 63.

8. If a numeric variable in an expansion had a number so large that it
overflowed, Exim crashed. Now it just inserts a null string, as for any other
unset numeric variable.

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