add read pivot table for excel2007

[loki36]

add read pivot table for excel2007 in order to not loose it. Pivot Table
is not editable
exemple
$objReader = PHPExcel_IOFactory::createReader('CSV')->setDelimiter(';')
->setEnclosure('"')
->setLineEnding("\r\n")
->setSheetIndex(0);

$objPHPExcelFromCSV = $objReader->load("fichier/tmp.csv");
$sheet1 = $objPHPExcelFromCSV->getSheet(0);
$sheet1->setTitle('data');

$objReader = PHPExcel_IOFactory::createReader('Excel2007');
$objReader->setIncludePivotTable(true);
$objPHPExcel =$objReader->load("template/template_Q.xlsx");

if($objPHPExcel->getSheetByName("data")){
$objPHPExcel->removeSheetByIndex(
$objPHPExcel->getIndex(
$objPHPExcel->getSheetByName("data")
)
);
}

// $objPHPExcel->addSheet($sheet1,0);
$objPHPExcel->addExternalSheet($objPHPExcelFromCSV->getSheet(0),0);

$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel,
'Excel2007');
$objWriter->setIncludePivotTable(true);
$objWriter->save("test.xlsx");

[MarkBaker]

Will take a look: thanks, as it's a much-demanded feature

[loki36]

I 'm at your service for changes needed for a merge

[MarkBaker]

Finally getting round to looking at this PR

[MarkBaker]

There's a number of problems with simply reading/writing the raw xml that I've noticed while testing, specifically if the pivot table uses any customised styling (e.g. for summarised totals with numberformatting) that isn't used in the main data sheets.