Excel writes some relative links with the $dir_long string.  We ignore

these cases for the sake of simpler code.

@see write_url() @param integer $row1 Start row @param integer $col1 Start column @param integer $row2 End row @param integer $col2 End column @param string $url URL string @param string $str Alternative label @param mixed $format The cell format

The SDK says the record length is 0x0B but Excel writes a 0x0C

length record.

@param array $col_array This is the only parameter received and is composed of the following

0 => First formatted column, 1 => Last formatted column, 2 => Col width (8.43 is Excel default), 3 => The optional XF format of the column, 4 => Option flags.