Fri, 19 Oct 2012 21:18:34 +0200 wenzelm ignore old stuff and thus speed up the script greatly;
Fri, 19 Oct 2012 20:15:14 +0200 wenzelm proper find -mtime (file data) instead of -ctime (meta data);
Fri, 19 Oct 2012 17:52:21 +0200 wenzelm made SML/NJ happy;
Fri, 19 Oct 2012 12:08:13 +0200 wenzelm clarified Future.map (again): finished value is mapped in-place, which saves task structures and changes error behaviour slightly (tolerance against canceled group of old value etc.);
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