OK,
curiosity has been stronger.
I found the get_currentuserinfo() function on two plugins:
$ find . -name "*php" -exec grep -nH "get_currentuserinfo" {} \;
./google-analyticator/google-analyticator.php:1288: get_currentuserinfo();
./all-in-one-seo-pack/aioseop_class.php:2170: if ( empty( $current_user ) ) get_currentuserinfo();
so I modified the two files.
Both problems are fixed but remains necessary the fixing at the origin (WP and plugins)
Bye