Refs #6078, fix column ordering bug, if 0 is used as pivotted table column, it is ordered first and not prepended.

Refs #6078, if pivotBy is used in request for HtmlTable visualization data, set columns to display to all available columns.

Refs #6078, set default of pivot_by_column to empty string so it doesn't get sent in AJAX requests when not set.

refs #6231 When a line is for a file with a known download extension and the user has specified --download-extension,
then any file with an extension not in the list will see its log line skipped

Adding new PivotByDimension DataTable filter that can pivot a report by (almost) any dimension. refs #6078

Refs #6078, fix regression in last commit and only send one request to save viewdatatable params when un-pivoting.

refs #5933 we must specifically invalidate day reports so that monthly reports have a chance to be re-processed. added note in the API comment.

Refs #6078, fix sorting on pivot table columns when columns use   (use decoded entity in PHP and do not select columns using jquery selector in dataTable.js).

Refs #6078, make sure $this->dataTable is instance of DataTable before calling disablePivotBySubtableIfTableHasNoSubtables.

According to http://forum.piwik.org/read.php?2,113613,page=1#msg-113739
php_uname will not return full string as in the shell, so we must first read shell_exec output

fixes #5933  New $period parameter to the API call CoreAdminHome.invalidateArchivedReports refs #6116

fixes #5932 Allow invalidated archive data to be used until they are re-processed

Refs #6078, make sure pivot option does not display if table is not pivotted and has no subtables (eg, when flattened).

Refs #6078, make sure visualizations default sort to first non-label column if filter_sort_column is not in columns_to_display and make sure changing pivot status undoes column sort.

Refs #6078, order pivot table columns by sum, descending and aggregate cut-off columns into 'Others' column.

Refs #6078, fix bug where reloading report does not persist pivot and where undoing a saved pivot does nothing.

Refs #6078, allow plugins to set what metric gets displayed in pivot tables of specific reports and use in Events to display nb_events. Also do not set columns_to_display in Events plugin if table is pivoted.

Refs #6078, add report metadata for Event subtable reports and make sure pivotBy works w/ Events plugins' secondaryDimension query parameter..

Make sure PivotByDimension respects original segment query parameter when fetching intersected tables by segment.

refs #4996 disable contents live test for now as it works on my server but returns different order or so on travis and I cannot fix it