Show policy, grading policy, and top-level errors

* Save errors for courses that failed to load in modulestore
* global staff can see course errors on their dashboard
* put policy loading errors into the error trackers
* add has_access(user, 'global', 'staff'), which is equiv to user.is_staff for now

common/djangoapps/student/views.py

@@ -140,7 +140,19 @@ def dashboard(request):
     if not user.is_active:
         message = render_to_string('registration/activate_account_notice.html', {'email': user.email})
 
-    context = {'courses': courses, 'message': message}
+
+    # Global staff can see what courses errored on their dashboard
+    staff_access = False
+    if has_access(user, 'global', 'staff'):
+        # Show any courses that errored on load
+        staff_access = True
+        errored_courses = modulestore().get_errored_courses()
+
+    context = {'courses': courses,
+               'message': message,
+               'staff_access': staff_access,
+               'errored_courses': errored_courses,}
+
     return render_to_response('dashboard.html', context)