Mark Thomas <mbthomas@fb.com> [Mon, 02 Oct 2017 14:05:30 -0700] rev 34554
util: add safename function for generating safe names to rename to
This function finds a name which does not clash with any other name in the
manifest, and so can be used to safely rename a file.
Differential Revision: https://phab.mercurial-scm.org/D783