------------------------------------------------------------
Add multiple sudoers files to do the following:

NAME/DEBCONF:               DESCRIPTION_

teachers-install:           Teachers can install everything
users-install:              Everybody kann install everything
teachers-all:               Teachers can do everything. others nothing 
teachers-all-users-install: Teachers can do everything, users can install 
teachers-all-users-all:     Teachers and users can do everything 

------------------------------------------------------------
- Make the above selectable by configure script
- save the name in a debconf value