Hide delete, give and save buttons if we are not the teacher.

EduNetworkBuilder/PersonProfileForm.cs

@@ -527,6 +527,12 @@ namespace EduNetworkBuilder
                 btnHWSave.Visible = true;
 
             }
+            else
+            {
+                btnHWDelete.Visible = false; //Only the teacher can delete the homework
+                btnHWGive.Visible = false;
+                btnHWSave.Visible = false;
+            }
             btnLaunch.Visible = true;
         }