Usage of the buttons in evaluation form multi and single selection edit controllers.

security callback

OO-3297: refactor the user management to use organization for managing the roles instead of named security groups

OO-3189: make the link to about page static, remove the invisible logout link from the index page, cannot open several times the about page without closing it, fix a memory leak in high score

OO-2844: add option to show the full text search to guest users, update check access of the different indexers, remove the context aware full text search in forum if the option is disabled