In the site here, database name and username are fixed by my ISP (Free.fr). So I
can't change them.
Wikimedia 1.5.1 could not work as is because I could not keep my login. Password
But cookies do not support names with dots so cookies are received in php with
that form :
Dots are converted to underline.
So I need make a patch to correct that. I've created a $wgCookiePrefix variable
that can have by default a value of $wgDBname. And then I need to change
all acces to cookies mainly in includes/SpecialUserlongin.php and
I can submit a patch.