tests: handles bytes/str mismatch in test-commit-interface-curses.t
This fixes various test failures on Python 3.
Differential Revision: https://phab.mercurial-scm.org/D5727
Mercurial's documentation is kept in reStructuredText format, which is
a simple plain text format that's easy to read and edit:
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http://docutils.sourceforge.net/
Use the Makefile in this directory to generate the man and HTML pages.