PSPP-BUG: [bug #11975] AGGREGATE should support MEDIAN function

[Ben Pfaff]

Follow-up Comment #2, bug #11975 (project pspp):

This looks to me like it implements median correctly, but doesn't it add an
additional data-reading pass for every median being calculated?  I think that
this extra pass could be eliminated by, instead of using sort_execute(),
calling sort_create_writer(), then writing a case to the writer in
accumulate_aggregate_info(), then obtaining the reader with
casewriter_make_reader() in dump_aggregate_info().

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