Zabbix

.......... [DEV-4055] added new test cases for sparkline charts

* commit '8aaa69b06ee7b3ac556a396c3a9204f1c1322e51':
  .......... [DEV-4055] added fixes regarding code review
  .......... [DEV-4055] added fixes regarding code review
  .......... [DEV-4055] added fixes regarding code review; added TODO
  .......... [DEV-4055] added fixes regarding code review
  .......... [DEV-4055] added TODO comment
  .......... [DEV-4055] fixed code style
  .......... [DEV-4055] changed data provider sequence
  .......... [DEV-4055] added test cases for widget appearance scenario
  .......... [DEV-4055] added new test cases for CheckTextItems scenario
  .......... [DEV-4055] added sparkline test cases for update/create test scenario; added widgets for time period references
  .......... [DEV-4055] added data provider test cases for update/create test scenario
  .......... [DEV-4055] changed data provider sequence
  .......... [DEV-4055] removed unused function from pie chart widget
  .......... [DEV-4055] added new checks for layout test
  .......... [DEV-4055] added missing check that was accidentally removed in column control feature
  .......... [DEV-4055] added sparkline fields for layout test