Qual: Clean code to be able to update combo box when removing a box.

htdocs/core/boxes/modules_boxes.php

htdocs/core/class/html.formother.class.php

htdocs/install/mysql/tables/llx_opensurvey_comments.key.sql

htdocs/install/mysql/tables/llx_opensurvey_comments.sql

htdocs/install/mysql/tables/llx_opensurvey_sondage.key.sql

htdocs/install/mysql/tables/llx_opensurvey_sondage.sql

...cs/install/mysql/tables/llx_opensurvey_user_studs.key.sql

htdocs/install/mysql/tables/llx_opensurvey_user_studs.sql