[Lazarus] fpspreadsheet excel5 export

[Felipe Monteiro de Carvalho]

Well, it seams to be unfeasable for me to implement this at the
moment, because my OpenOffice cannot read nor write Excel5 files in a
different charset from Latin1. Therefore I cannot test my
implementation (I don't have Excel).

But anyway, you can also just use Excel 8 or OpenDocument format to
get full unicode support.

-- 
Felipe Monteiro de Carvalho