[patch] Spreadsheet_Excel_Writer open_basedir workaround fix

Hello, I ran into a problem using Spreadsheet_Excel_Writer on a server with open_basedir restriction. In the current CVS version the _tmp_dir set by setTempDir() won't get propagated from the workbook to the worksheets, so Spreadsheet_Excel_Writer_Worksheet::_initialize() will try to use tmpfile() and fail - writing the Warning into the generated Excel file. The appended patch will: - add a parameter $tmp_dir to the constructor of Spreadsheet_Excel_Writer_Worksheet - make the Spreadsheet_Excel_Writer_Workbook::addWorksheet() factory pass the value of $this->_tmp_dir to the Spreadsheet_Excel_Writer_Worksheet constructor As Spreadsheet_Excel_Writer_Worksheet::_initialize() is called directly from the contructor, this cannot be set later. Spreadsheet_Excel_Writer_Worksheet is private, so the public API does not change. I do not claim copyright for this small fix, use as you see fit. Feedback appreciated. Regards, Sandro Berg

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