In https://github.com/python/cpython/pull/31530
https://bugs.python.org/issue46836

the `_frame` struct was moved to an internal header, however the public API is
primarily read-only, and Cython needs to build PyFrameObjects so still import
the internal headers.

Also sets the Py_BUILD_CORE define for py311a6, trying to restrict it to the frame header.

In https://github.com/python/cpython/pull/31530
https://bugs.python.org/issue46836

the `_frame` struct was moved to an internal header, however the public API is
primarily read-only, and Cython needs to build PyFrameObjects so still import
the internal headers.

Also sets the Py_BUILD_CORE define for py311a6, trying to restrict it to the frame header.

Closes https://github.com/cython/cython/issues/3066

Fix minimal compile mode. FlowControl.py also needs to be compiled since it depends on the C level interface of Visitor.py.

Memoryview temps weren't being properly incremented (at the start
of the loop) or decremented (at the end of the loop). They were,
however, decremented in the exception handling case.

Long-term I think we really should unify reference counting for
memoryviews further. It's *slightly* different from PyObjects
(mainly that it happens in wrapper functions rather than the
main function) and that leads to a large chance that it just
gets missed.

Fixes https://github.com/cython/cython/issues/4662

Improve the bug/feature templates to provide a clearer hint why cython-users is a better place to get help than the bug tracker.

Fix test by adding "expected" warnings. These should rather be avoided, but this is the easiest fix for now (and it's not the only ones).

See https://github.com/cython/cython/issues/4310

Turn the redeclaration of attributes as C methods into an error since it currently leads to difficult to predict behaviour. (#4661)

Remove Stackless hack for looking up "PyFrameObject.f_localsplus" from Stackless 3.8 on. CPython never needed this.

Closes https://github.com/cython/cython/issues/4329

See https://github.com/cython/cython/issues/4310

See https://github.com/cython/cython/issues/4310

This creates two copies of the function, one for the exception
case and one for the non-exception case. It's probably inefficient
but the simplest solution.

Fixes https://github.com/cython/cython/issues/4651.

This creates two copies of the function, one for the exception
case and one for the non-exception case. It's probably inefficient
but the simplest solution.

Fixes https://github.com/cython/cython/issues/4651.

Closes https://github.com/cython/cython/issues/4655

Add a "minimal compile" build mode that speeds up the compiler somewhat but keeps the number of compiled modules low.

runtests: Print shard number also for each command in the EndToEnd test error output to make it easy to find in the logs.

runtests: print the shard number in front of the test name to show which was the last test in case it hangs.