DEP: Issue FutureWarning when malformed records detected. #10558
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Backport of #10543.
Currently records specified as lists of lists instead of lists of tuples
are caught and fixed up in fromrecords. Unfortunately, the detection is
failing due to various fixes in the records module. The failure is
worked around by generalizing the detection. A FutureWarning that such
record specifications will result in an error in the future is also
emitted.
Fixes #10344.