Zabbix

 - added link to ZABBIX manual from all forms (Alexei)
 - icmppingsec to return '0' if cannot ping (Alexei)
 - added error reason for unsupported items (Alexei)
 - added error reason for unreachable hosts (Alexei)
 - added hosts.error (Alexei)
 - added items.error (Alexei)
 - added alerts.error (Alexei)
 - added error reason for undelivered alerts (Alexei)
 - added upgrades/dbpatches/1.1alpha3_to_1.1alpha4 (Alexei)
 - fixed empty macros in alert messages if '.' in key (Alexei)
 - do not show menu item if no permissions (Alexei)