Justin S 71fb29fccf muscle: add 3.8.31 (#15974) ... * muscle: add 3.8.31 * muscle: use build_directory property * muscle: add url_for_version, fix version comparison		2020-04-14 11:13:16 -05:00
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spack	muscle: add 3.8.31 (#15974)	2020-04-14 11:13:16 -05:00