gnus-art.el, mm-uu.el: Misc improvements for displaying MIME parts
* gnus-art.el (gnus-mime-inline-part, gnus-mm-display-part): Work for the last MIME part in an article. (gnus-mime-display-single): Suppress excessive newlines between parts. * mm-uu.el (mm-uu-dissect): Assume that separators may be accompanied by leading or trailing newline.
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