Zabbix

A.F....... [ZBX-16822] fixed performance issues for installations with a lot of historical alerts

(cherry picked from commit f0535a608f54267410ce2735b564a692b961401c)

Conflicts:
	ui/app/views/hint.box.php
	ui/app/views/monitoring.widget.problems.view.php
	ui/include/actions.inc.php
	ui/include/blocks.inc.php
	ui/include/classes/screens/CScreenHostTriggers.php
	ui/include/classes/screens/CScreenProblem.php
	ui/include/events.inc.php