lib/Tools/components
2018-12-09 wenzelm clarified settings and defaults;
2018-11-30 wenzelm more robust: avoid broken tar.gz;
2016-07-14 wenzelm prefer curl: presumably more portable and versatile;
2013-09-06 wenzelm tuned;
2013-08-30 wenzelm check tar error, e.g. from corrupted download;
2012-12-31 wenzelm simplified quick start via "isabelle components -I";
2012-08-17 wenzelm minor robustification;
2012-08-17 wenzelm added "isabelle components" tool;
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