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Estimated hours taken: 3 Add some test cases to test interactive queries. tests/debugger/queens.inp: Add tests of interactive queries. tests/debugger/Mmakefile: Add dependency of queens.out on queens.ints. This is needed in order for us to use interactive queries. tests/debugger/queens.m: Export qperm/2, for use in interactive queries. browser/interactive_query.m: Flush MDB_stdout after printing the prompt, so things work properly with I/O redirections. trace/mercury_trace_internal.c: Fix an off-by-one error detected by the above test cases.