Finish format csv and xls in FannieReportPage

Changes for multiple headers, space between reports and html-stripping.

Tested report_formt csv and xls with multi_report_mode on and off.

Also see a change to ArrayToXls.php in https://github.com/CORE-POS/IS4C/commit/8ddb97d4b83bd33afcd67f3d21899513f34a4602