PHPOffice/PHPExcel — pull request #70 by techhead (2012-10-25 13:58:50+00:00)
Title: Fixed formula/formatting bug when removing rows

When columns were being added/removed, empty cells were being overwritten with blank cells that specified the default format, effectively overwriting the column format.

Also, when removing columns, there was an order-of-operation bug that caused some formulas to be rewritten incorrectly.