Zabbix

 - added parameter SenderFrequency to zabbix_suckerd configuration
 file (Alexei)
 - added frontends/include/defines.inc.php (Alexei)
 - added column services.algorithm (Alexei)
 - list of test cases added to the Manual (Alexei)
 - emails to be sent in case of TRUE-UNKNOWN-FALSE and v.s. (Alexei)
 - one zabbix_suckerd to send alerts (Alexei)
 - minimum number of zabbix_suckers StartSuckers is set to 3 (Alexei)
 - added alerts.retries (Alexei)
 - added alerts.status (Alexei)