Zabbix

A......... [ZBXNEXT-6470,ZBXNEXT-6980] fixed the fields of old type was not resets to default values in case when type was changed during the update operations of inheritance; fixed not all fields of old type was resets to default values in case when type was changed with item.update, itemprototype.update API methods; simplified code; fixed inability to set inventory link for item with text value type