README for zabbix server

Contents of this file were wikified, see current version at:
http://crux.nu/Wiki/InstallingZabbix

PRECAUTION
For detailed upgrade instructions please refer to
http://www.zabbix.com/documentation/1.8/manual/about/installation_and_upgrade

After upgrading from version 1.6.4 default log file location was changed,
adjust /etc/zabbix/zabbix_server.conf:
 LogFile=/var/log/zabbix_server/zabbix_server.log
and change it's permissions, and possibly delete old log dir.
