[PATCH] emacs: globally replace non-branching "(if (not ..." with "(unless ..."

[David Edmondson]

On Thu, 12 Jan 2012 18:33:06 +0100, Pieter Praet <pieter at praet.org> wrote:
> Less code, same results, without sacrificing readability.

+1, but why not replace non-branching `if' with `when' as well?
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