David Mudrak
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MDL-33330 Use the referencehash when searching for references ...
Together with this, refactoring and cleanup of search_references() and
similar methods was done. SQL was improved to use the INNER JOIN instead
of the LEFT JOIN as we are really interested in records that have a
reference. Also, joining the {repository_instances} table assures that
only references with valid repository_instance are returned (the check
against is_external_file() can't be applied to the methods that return
the count of references so I dropped it completely).
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