Summary: This will allow us to move it into core
Test Plan: it still works
Reviewers: #sourcecontrol, ttung
Differential Revision: https://phabricator.fb.com/D2784362
Summary: add the chistedit extension that adds an interactive ncurses based
interface for histedit. It requires python-curses to be installed and the
Mercurial histedit extension to be enabled.
Test Plan: enabled and used it
Reviewers: durham, sid0, pyd
Differential Revision: https://phabricator.fb.com/D1662465