[samigo-team] SAM-2102 small hibernate patch

[Sam Ottenhoff]

On the latest trunk, taking a 16-question random draw (2 questions each in
8 parts from a 42-question pool) assessment generates about 9886 queries to
the database.

I uploaded a small patch to the hibernate mapping file that reduced the
number of queries for my one attempt down to 1539 queries.

Can someone review?

https://jira.sakaiproject.org/browse/SAM-2102

--Sam
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