[RFC] New document for writing macros

[Denis Barbier <nospam@thanx>]

I have written wml_macros, which explains how to build ePerl nestable
macros  This paper is available at
  http://www.engelschall.com/sw/wml/distrib/wml-SNAP/wml_docs/wml_macros.pod

Any comments or improvements are welcome.
This was the last item on my TODO list, so i will release WML 2.0 after
a final check, it may take few days.

-- 
Denis Barbier
WML Maintainer

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