Update to 2.4.3.
If all goes well, this will be the last 2.x release before a 3.0 major release.
The 2.4.3 release is primarily aimed at fixing bugs, but a few small features
have been added:
* Treat the -u argument to sendBuildCompletionMail as a username rather than an
arbitrary database ID. Also, do better error checking in case a user has not
been defined in the datastore.
* Add -b <build name> support to the listBuildPortsQueue command.
* Add a new tc command, getPortLastBuiltStatus to get a port's last status.
* Properly quote the UPDATE_CMD argument in the *PortsTreeUpdate hooks.
* Add a new tbkill.sh tool to terminate a running tinderbuild.
* Add a new tinderbuild option, -norebuild, which will prevent tinderbuild from
forcing a rebuild of any packages specified on the command line.
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