Commit my work-in-progress for zabbix.

Update to version 2.4.2.

Split out zabbix-agent and zabbix-server as separate packages;
the main zabbix dir doesn't create a package itself.

The zabbix-agent has been tested and appears to work fine.

Zabbix-server by default compiles with sqlite3 support which
you probably don't want to use.  Separate packages for the
proxy agent, the frontend, and possibly separate server packages
depending on database choice remains to be done.
Replace zabbix with zabbix-agent and zabbix-server.
Install zabbix agent config files in example dir.
Hm, fix silly syntax error.
More syntactic nits...
Hm, enough with this "commit on one, test on another".
This time, make sure we actually install the config files
in the correct spot and include them in PLIST.