Mon, 02 Oct 2017 16:42:12 +0200 wenzelm more documentation;
Mon, 02 Oct 2017 16:41:59 +0200 wenzelm clarified imports: prefer parent session images;
Mon, 02 Oct 2017 16:08:43 +0200 wenzelm eliminated old-style no-document imports;
Mon, 02 Oct 2017 15:51:52 +0200 wenzelm proper document;
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