test-split: split now ignores diff.* settings
From 66399f2e92aa: "It is assumed by the author that the `[diff]` section is
primarily for *viewing* diffs, and that it is unlikely what people intend when
attempting to commit or revert."
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Copyright 2011 Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
Logilab SA <contact@logilab.fr>
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
Patrick Mezard <patrick@mezard.eu>
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