Fixing regression dashboard widget refactor, make sure to include widget template HTML in Widgets top bar link.
Changed related to ComparisonDashboard:

- Added piwik:dataTableLoaded event to DataTable & ActionsDataTable.
- Remove server-side limiting of Dashboard menu links.
- Remove use of addEventListener/removeEventListener for IE8 compatibility.
- Allow viewDataTable types that are auto-maximised when widgetized to overridden.
- Fix bug in segment editor update segment (search for segment by idSegment).