cext: make revlog.c PY_SSIZE_T_CLEAN Without this, Python 3.8 emits a deprecation warning, as using int for # values is deprecated. Many existing modules use PY_SSIZE_T_CLEAN, so this shouldn't be contentious. I audited the file for all # formatters and verified we are using Py_ssize_t everywhere now. Differential Revision: https://phab.mercurial-scm.org/D6196

tests: add optional output for Python 2.7 deprecation We already had one of these a few lines above. We need it here as well. Differential Revision: https://phab.mercurial-scm.org/D6203

setup: use raw string for regular expression Otherwise Python 3.8 complains about the backslash. Differential Revision: https://phab.mercurial-scm.org/D6202

automation: use raw strings when there are backslashes Otherwise Python 3.8 complains. Differential Revision: https://phab.mercurial-scm.org/D6201

perf: make perf.run-limits code work with Python 3 We need b'' because perf.py isn't run through the source transformer. We need to cast the exception to bytes using pycompat.bytestr() because ValueError can't be %s formatted due to built-in exceptions lacking __bytes__. We need to pycompat.sysstr() before the float() and int() cast so the ValueError message doesn't have b'' in it. Even with that, it looks like the error message for the ValueError for float casts added quotes, so we need to account for that in test output. Differential Revision: https://phab.mercurial-scm.org/D6200

localrepo: rename crev in _filecommit() to cnode, since it's a node I know we often use "rev" generically, but here's it always a node, so it helps to be specific. Differential Revision: https://phab.mercurial-scm.org/D6181