deprecate extracting dates in message headers #1015
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adds Session.extract_header_dates config and JUPYTER_SESSION_EXTRACT_HEADER_DATES env.
Proposal for #1014 because I'm not sure the best way to handle the deprecation.
Even if we don't deprecate the current behavior, the instance config here would allow ipyparallel to remove its monkeypatch.
default unchanged, but deprecated
closes #1014
closes #590