Direct navigation beyond Next Task to be available only to Teacher & above

[richardpawson]

Students must either navigate through UI (Next Task) or having completed Task n be allowed to navigate directly to Task n+1 through the URL (given in book).

If possible the message should distinguish between.

• Task No. does not exist
• Task is in a project not assigned to you (for students: ask your teacher)
• Task is not accessible to you until you have completed Task x.

[richardpawson]

Completed