#3 fix ExtractShema function

[Benoit Chesneau]

ACtually if you try to extract xmls shema you have
warning with html entities :

Warning: htmlentities() expects parameter 1 to be
string, array given in
/home/benoitc/Work/archlinuxfr/include/adodb/adodb-xmlschema.inc.php
on line 1986

Here is the patch to fix it. I assi $va to $row[$key]
rather than $row array wich should be the normal way I
think.

[Benoit Chesneau]

adodb-xmlschema.inc.php.diff