Warning in report.php

Call-time pass-by-reference has been deprecated...
Line 210, 530, 583 and 616 :
calling functions print_row_stats_data and report_question_stats using reference causes a PHP 5.2 to generate this warning.

The fact these function are using values by reference is correctly defined in the function definition.
It is just enough to remove & (reference sign in the lines).

See attached file.