Issue #11168: Remove filename debug variable from PyEval_EvalFrameEx().
It encoded the Unicode filename to UTF-8, but the encoding fails on
undecodable filename (on surrogate characters) which raises an unexpected
UnicodeEncodeError on recursion limit.

Issue #11169: compileall module uses repr() to format filenames and paths to
escape surrogate characters and show spaces.

Issue #11187: Remove bootstrap code (use ASCII) of
PyUnicode_AsEncodedString(), it was replaced by a better fallback (use
the locale encoding) in PyUnicode_EncodeFSDefault().

Prepare also empty sections in NEWS.

package had previously been installed.

with large config files.

Many tests simply didn't care if they unset a pre-existing trace function. This
made test coverage impossible. This patch fixes various tests to put back any
pre-existing trace function. It also introduces test.support.no_tracing as a
decorator which will temporarily unset the trace function for tests which
simply fail otherwise.

Thanks to Kristian Vlaardingerbroek for helping to find the cause of various
trace function unsets.

larger than 4GB.  Patch by Nadeem Vawda.

#11249: in PyType_FromSpec, copy tp_doc slot since it usually will point to a static string literal which should not be deallocated together with the type.

Patch reviewed by Raymond Hettinger, permission from Georg Brandl to commit
during an RC.

#941346: Fix broken shared library build on AIX. Patch by Sebastien Sable, review by Antoine Pitrou.