perf: introduce a `--iteration` to `perfdirstate` This flag benchmark an iteration over all the file in the dirstate. This will be useful to compare the Python and the Rust implementation of the dirstate.

tests: open file in binary mode in test-upgrade-repo.t Otherwise the file sizes printed in the output diverge from other platforms. Differential Revision: https://phab.mercurial-scm.org/D7081

hghave: use a native string to invoke the `black` command Windows can't create a process based on bytes. Apparently only the output test in `matchoutput` wants bytes. Differential Revision: https://phab.mercurial-scm.org/D7080

py3: convert cwd to native string when running `fix` This prevents a bunch of failures on Windows. Differential Revision: https://phab.mercurial-scm.org/D7079

format: format commands.py, which recently regressed # skip-blame just reformatting Differential Revision: https://phab.mercurial-scm.org/D7064

py3: fix test-bad-extension expectations for py35 ModuleNotFoundError was introduced in 3.6, so the tests need to expect to see ImportError with 3.5. Differential Revision: https://phab.mercurial-scm.org/D7063

phabricator: add addremoved and addmodified functions These are relatively simple so add them together. As the name indicates, these add phabchange objects for removed and modified files to the phabdiff. Differential Revision: https://phab.mercurial-scm.org/D7049

phabricator: add makebinary and addoldbinary functions These populate the phabchange with the data for a binary file, much as maketext does for text files. Differential Revision: https://phab.mercurial-scm.org/D7048