- Added support for wildcard subscriptions using + and #.
- All network operations are now non-blocking and can cope with partial
packets, meaning that networking should be a lot more reliable.
- Total messsages/bytes sent/received are now available in $SYS.
- Improved logging information - use client ip address and id instead of
socket number.
- Broker build timestamp is available in $SYS.
- Keepalive==0 is now correctly treated as "never disconnect".
- Fixed manpage installation.
- Fixed incorrect $SYS hierarchy locations in documentation and code.
- Debug type log messages are no longer sent to "topics".
- Default logging destination no longer includes "topics" to prevent possible
error logging to the db before it is initialised.
- Periodic $SYS messages can now be disabled.
- stdout and stderr are flushed when logging to them to give more timely
updates.
- dup is now set correctly when resending messages.
- Database format bumped due to topic column naming fix.
