Check archive md5 sums#169

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frejanordsiek wants to merge 2 commits intoquicklisp:masterfrom

frejanordsiek:check-archive-md5

Commits on Jul 1, 2018

Added verification of MD5 sums for archive files.
frejanordsiek
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Fixed mention in README.txt of which files have code from the md5 package.
frejanordsiek
committed