Replace PIL.OleFileIO warning with descriptive ImportError #2833
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The vendored version was removed in #2199, on 13 Dec 2016, in favour of the olefile Python package and replaced with a deprecation warning that PIL.OleFileIO would be removed in a future version.
We've had four quarterly releases since then (4.0.0, 4.1.0, 4.2.0, 4.3.0), shall we now
finish this offreplace it with an import error that says the same thing and then remove it at a later date?See #2784 for removal at a future date.
cc: @decalage2 @jdufresne