Fields :
- User name: only lowercase letters without accent and digits are allowed in the user name.
 - Lastname
 - Firstname
 - Password
 - Email
 - Role; possible values : student, tutor, supertutor (same as tutor but with access to information on all students), author (same rights as a tutor but does not appear in the list of tutors), administrator (access to the administration interface), system (all privileges)
 - Birthdate: birthdate with the format YYYY-MM-DD
 - Training: code for the training
 - Level (unused by default) (scientific, not scientific)
 - Modules (unused by default): modules followed by a student
 - Subject (unused by default): subject taught, for the teachers training
 - Class (unused by default): class taught, for the teachers trainin
 - Registration date: date the registration was sent, with the format YYYY-MM-DD
 - Closing date: date the account was closed, with the format YYYY-MM-DD if it is closed. Empty if the account is open. A method to close an account consists in writing today's date in this field.
 - Tutor: the interface lists all tutors to make it easier to select one.
 - Center: training center (unused by default)
 - Valid: checked if the registration has been validated. A way to sent validation emails again consists in unchecking the valid checkbox, save the fields, recheck the checkbox and re-save.
 
User address :
- Street
 - Zip code
 - Town
 - Country
 - Phone number
 - Connection
 - Access
 
Actions availables with the user lists :
- Close : sets the account closing date to today's date
 - Remove : after a confirm, deletes the account with all associated information (connections, page readings, replies to exercises)