..F....... [ZBX-8524] fixed trigger filter not being reset on the Monigoring->Events page

Before the fix:
- If you open the Monitoring->Events page, select some trigger, press "Filter" and then "Reset", the trigger will disappear from the filter but the event list will still remain filtered. Only when you press "Reset" once more will the filter be completely reset.

After the fix:
- The filter is reset properly. Additionally, to simplify the logic of the filter, selecting all hosts will no longer clear the trigger filter. This goes the same for the case when you switch a host group and all hosts are selected automatically.

git-svn-id: svn://svn.zabbix.com/trunk@48564 f4e7fd02-d210-4e34-a1e0-d4093fb66cc2
..F....... [ZBX-8624] Fix inconsistent header layout in Monitoring->Discovery page.

git-svn-id: svn://svn.zabbix.com/trunk@48570 f4e7fd02-d210-4e34-a1e0-d4093fb66cc2
..F....... [ZBX-8616] Fix link to host items in Inventory->Hosts host view.

git-svn-id: svn://svn.zabbix.com/trunk@48573 f4e7fd02-d210-4e34-a1e0-d4093fb66cc2
...G...... [ZBX-8664] allow empty values for agent items


git-svn-id: svn://svn.zabbix.com/trunk@48579 f4e7fd02-d210-4e34-a1e0-d4093fb66cc2
.......... [ZBX-8664] add missing ChangeLog entry


git-svn-id: svn://svn.zabbix.com/trunk@48580 f4e7fd02-d210-4e34-a1e0-d4093fb66cc2
..F....... [ZBX-8675] removed sortorder sorting from IT services popup window

git-svn-id: svn://svn.zabbix.com/trunk@48599 f4e7fd02-d210-4e34-a1e0-d4093fb66cc2
...G...PS. [ZBXNEXT-101] added functionality for changing log level at runtime, added new trace log level for extended web and vmware monitoring

git-svn-id: svn://svn.zabbix.com/trunk@48604 f4e7fd02-d210-4e34-a1e0-d4093fb66cc2
.D........ [ZBXNEXT-101] fixed ChangeLog entry

git-svn-id: svn://svn.zabbix.com/trunk@48609 f4e7fd02-d210-4e34-a1e0-d4093fb66cc2
........S. [ZBX-8414] fixed value cache statistics update when database contains only part of requested data
                      fixed value cache single value request returning FAIL for not found items in low memory mode
           [merge ^/branches/2.2 -c r48611]


git-svn-id: svn://svn.zabbix.com/trunk@48612 f4e7fd02-d210-4e34-a1e0-d4093fb66cc2
.......... [ZBXNEXT-826] updated release date [2.3.4]

git-svn-id: svn://svn.zabbix.com/trunk@48613 f4e7fd02-d210-4e34-a1e0-d4093fb66cc2
.......... [ZBXNEXT-826] Windows precompiled agents [2.3.4]

git-svn-id: svn://svn.zabbix.com/trunk@48616 f4e7fd02-d210-4e34-a1e0-d4093fb66cc2
.......... [ZBXNEXT-826] updated release version [2.3.5]; updated API version [2.3.5]

git-svn-id: svn://svn.zabbix.com/trunk@48620 f4e7fd02-d210-4e34-a1e0-d4093fb66cc2