Log Message:
Update p5-Spreadsheet-WriteExcel to 2.18.
Patch provided by Mark E. Perkins in PR 36465.

2.18 January 18 2007 - Minor

    ! Correct invalid user set_column() calls to prevent
      crashes after Excel patch KB918419 is applied.
      Thanks to Sharron McKenzie for debugging.

    ! Fixed bug when writing comments longer than 8219 bytes.
      Reported by jscaglione.

    ! Fixed bug when using copy() with merged formats.
      Reported by jscaglione.

    ! Fixed bug where $@ was clobbered during garbage collection.
      Reported by afoxson.
      http://rt.cpan.org/Public/Bug/Display.html?id=24218

    ! Removed all non-ascii characters from main docs to
      avoid problems with troff and man.
      Reported by Ken Williams.
      http://rt.cpan.org/Public/Bug/Display.html?id=20948

    + Added autoloading of OLE::Storage_Lite, when available,
      to create workbooks larger than 7MB. It is no longer
      required to explicitly use ::Big.

    + Added handling of Unicode sheet names in formulas
      as suggested by Zhur:
      http://rt.cpan.org/Public/Bug/Display.html?id=20059