sslutil: be less strict about which ciphers are allowed when using --insecure Python 3.10 restricted which ciphers are enabled by default, leading to no available ciphers for TLS < 1.2. When using the --insecure flag we allow old TLS, so also adjust the cipher list to give connections a chance to work. On the server side, also loosen the cipher selection in tests (when using the devel.serverexactprotocol option). Differential Revision: https://phab.mercurial-scm.org/D12489

sslutil: avoid deprecation warnings from python 3.10's ssl module Use ssl.PROTOCOL_TLS_{CLIENT,SERVER} and SSLContext.{min,max}imum_version when supported (3.7+). And, catch deprecation warnings when the user asks for deprecated TLS versions (1.0 and 1.1). Differential Revision: https://phab.mercurial-scm.org/D12488

zeroconf: fix deprecation warning with python 3.10 threading.condition.notifyAll → threading.condition.notify_all Differential Revision: https://phab.mercurial-scm.org/D12487

test: deal with changed error message on python 3.10 Differential Revision: https://phab.mercurial-scm.org/D12493

mail: don't complain about a multi-word email.method I want to be able to set email.method to "ssh relay /usr/sbin/sendmail" without needing an extra trivial shell script. This works fine since we pass the full command to a shell, except for validateconfig trying to find it in $PATH. Differential Revision: https://phab.mercurial-scm.org/D7542

help: set the large-file-limit to 10MB This is a minor increase (5%) and makes the doc much clearer. Differential Revision: https://phab.mercurial-scm.org/D12484

help: clarify the unit of `ui.large-file-limit` config Its might be a bit confusing, especially since `large-file.min-size` uses MB. Differential Revision: https://phab.mercurial-scm.org/D12483

debuglock: ignore ENOENT error when unlocking This is consistent with the main `lock.release` code. Differential Revision: https://phab.mercurial-scm.org/D12481

run-tests: introduce "forward-slash" version of everything on windows This should be useful for some shell invocation. Differential Revision: https://phab.mercurial-scm.org/D12480

tests-racy-mutation: pass the editor through config instead of env variable On Windows msys seems to do awful mangling of the environment variable content that confuses everything to the death. Going through the config works fine, so we do that instead. Differential Revision: https://phab.mercurial-scm.org/D12479