[emacs] remove slack and most of its deps
authorAmin Bandali <bandali@gnu.org>
Thu, 20 Dec 2018 14:18:28 +0000 (09:18 -0500)
committerAmin Bandali <bandali@gnu.org>
Thu, 20 Dec 2018 14:18:28 +0000 (09:18 -0500)
except alert and ht which may come in handy later


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