Fix some lingering changes from user -> task

kernel/modelverse_kernel/compiled_legacy.py

@@ -404,10 +404,10 @@ def instantiated_name(a, b, **remainder):
 
 def __get_input(parameters):
     mvk = parameters["mvk"]
-    user_root = parameters["user_root"]
+    task_root = parameters["task_root"]
     while 1:
         try:
-            gen = mvk.input_init(user_root)
+            gen = mvk.input_init(task_root)
             inp = None
             while 1:
                 inp = yield gen.send(inp)

kernel/modelverse_kernel/main.py

@@ -98,7 +98,7 @@ class ModelverseKernel(object):
 
             return handler.handle_request(reply)
         except:
-            print("Unknown error @ " + str(self.debug_info.get(taskname, "Username unknown")))
+            print("Unknown error @ " + str(self.debug_info.get(taskname, "Unknown task")))
             raise
 
     def execute_rule(self, taskname):
@@ -696,11 +696,9 @@ class ModelverseKernel(object):
             # gives us O(1) state reads per jit-interpreter transition.
             exception_return, = yield [("RD", [task_frame, primitive_functions.EXCEPTION_RETURN_KEY])]
             if prev_frame is None:
-                print("Frame empty; delete task " + str(self.taskname))
                 _, =            yield [("DN", [task_root])]
                 del self.debug_info[self.taskname]
             else:
-                print("Previous frame found")
                 if self.debug_info[self.taskname]:
                     self.debug_info[self.taskname].pop()
                 _, _ =          yield [("CD", [task_root, "frame", prev_frame]),