Introduced bfbin2xlxml

bfbin2xlxml converts Byfl data to Microsoft Excel XML Spreadsheet 2003
format.  XML Spreadsheet has been superseded by Office Open XML
(ECMA-376) but is vastly simpler to generate and so far, seems to work
with both Microsoft Excel 2013 and LibreOffice.
Transpose key:value tables in the XML output
Man page for bfbin2xlxml
Renamed bfbin2xlxml to bfbin2xmlss

I encountered a page on microsoft.com that used "XMLSS" as the
shorthand name for the format.
bfbin2xmlss default output to stdout