Tim Hunt afb1b3d03b MDL-39980 question engine: Attempt on last loses response files
When doing Each attempt builds on last, we need to copy any response
files into a draft file area, and then re-save them.

While writing the unit test for this, I had to deal with a todo in the
question engine so that questions with files in the response could be
unit-tested.

I also found an fixed a bug with qtype_essay_question::is_same_response
and fixed some notices in the existing essay/manual graded unit tests.
2013-08-15 12:55:13 +01:00
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