As a student, i want to be able to upgrade my account to be a lecturer.

[Blatzheim]

Description:
In the profile settings, under edit, a student should have the ability to upgrade his account to a lecturer account by going through the same process as in the signup, with the lecturer key.

Depends on: #326

AC:

• On a students profiles edit page (click on upper right corner button "show profile" > edit profile) , there is a text-filed labeled "Lecturer Key"
• Below the text field, it says in small grey letters "Become a lecturer by entering the lecturer key."
• The title matches the other fields title's, and so does the subtitle match the others subtile.
• Given the user has entered a lecturer key (field is not empty), clicking on "Update" will prompt a warning: "Are you sure you want to be a lecturer? This action can not be undone! You will loose all your course data."
• Given that the warning is displayed, the user has the option of either accepting or denying (Yes / No ).
• Given that the student entered the wrong lecturer key and accepted the warning (clicked "Yes"), a message "Lecturer key incorrect" is displayed at the top in a red checkbox (like all announcements we have).
• Given that the student entered the correct lecturer key and accepted the warning (clicked "Yes"), his account will effectively be promoted to that of a lecturers.
• Given that the user choose any of the warnings options, he will be redirected to his profiles page (/users/show, not /users/edit).

Hint: Be aware that the students data might have to be deleted / reset in order to not affect correct behaviour."

[adrianjost]

My Idea would be to delete the account when doing this action and creating a new one automatically. Then the user might have to log in again and is a teacher. I think upgrading a teacher account to a lecturer account is unsafe because of a lot of possible side effects like duplicate views and so on.
Also because there is no way of downgrading yet, the information for the ex-student would be lost anyway.