[plt-dev] mzlib/compile and atomic renaming

I'd like to change mzlib/compile to use atomic renaming to avoid some
problems on DrDr and a setup-plt parallelization experiment I am
doing.

A new version is attached. I have tested it on my setups, but I'd like
to post before committing. Comments?

Jay

-- 
Jay McCarthy <jay at cs.byu.edu>
Assistant Professor / Brigham Young University
http://teammccarthy.org/jay

"The glory of God is Intelligence" - D&C 93
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