Qsmtp-0.24: Qsmtp version 0.24

• Qremote: allow control/smtproutes to point to localhost if a port different from 25 is used
• Qremote: better command pipelining
• Qremote: fix crash when all MX records point back to localhost (introduced in 0.23)
• Qsmtpd: authentication is required in submission mode (i.e. when run on port 587)
• Qsmtpd: improve check for usability of checkpassword helper
• Qsmtpd: reject unencoded 8 bit data in incoming Date, From, and Message-Id headers
• Qsmtpd: allow IP-specific SSL certificates
• Qsmtpd: ignore the client order of SSL ciphers if a preferred list is configured
• fix error handling in ssl_timeoutread()