gzip: use the stdlib version with python 3 (issue6284) It turned out that the stdlib gained the feature we missed in python 3.1. We can now use it directly.

gzip: indent the custom Gzip code We need a new conditional in the next changesets (Adding 3.8 support). We do the large code move beforehand for clarity.

gzip: rename the argument to `mtime` to match upstream python Python gained the feature we missed in 3.1. The argument name is `mtime`. We align our version for consistency.

heptapod-ci: run the test from outside the test directory This will help detecting case where this is broken.

run-tests: fix conditional when tests are run outside of `tests` The logic to find `hghave` was using `__file__` but… non absolute path in `__file__` gets wrong as soon as we change directory (thanks python… you are being helpful). The rest of the `run-tests.py` code already deal with this fine. We simply reuse the `RUNTESTDIR` variable to fix it.

merge with stable

tests: use native string type for parsed hghave log lines Before this change, on Python 2, the parsed messages were decoded to unicode, causing an implicit conversion from unicode to str later.

tests: avoid implicit bytes -> unicode -> bytes roundtrip on Python 2 Before the change, there were two implicit conversions: * The format string was converted to unicode because the substituted values were unicode. * When printing the message in log(), the string was converted from unicode to str.

cext: make HgRevlogIndex_GetParents private again The rust's direct-ffi code need to access this function. Now that it `direct-ffi` is no more. We can make this function `static` again. This change was suggested by `Yuya Nishihara`.

setup-rust: remove the legacy 'direct-ffi' variant This variant have been abandoned for a while. Keeping it around just get people confused.