Zabbix

 - [ZBXNEXT-672] fixed deleting host group if it contains hosts linked to a single host group, if host group is linked to global scripts;
 - [ZBXNEXT-672] fixed deleting user groups linked to global scripts;
 - [ZBXNEXT-672] improved showing global script commands on separate lines;
 - [ZBXNEXT-672] added global script name in error string on adding incorrect action operation;