SQL/XML publishing function experimental patch

Hello

This patch contains SQL/XML public function XMLFOREST, XMLELEMENT, ... based
on CString type. This patch hasn't high quality, but can be usefull for
testing funcionality, and maybe for some people. Patch needs initdb and
following registration:

CREATE AGGREGATE pg_catalog.fast_cstring_concat (
    BASETYPE = cstring,
    SFUNC = xmlagg_trans,
    STYPE = text,
    FINALFUNC = xmlagg_final);

I invite all notes, ..

Best regards
Pavel Stehule

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