compiling AST from Python objects.

make opening brace of container literals and comprehensions correspond to the line number and col offset of the AST node (closes #25131)

Patch by Neil Girdhar.

("make smelly" now clean)

filenames anymore on Windows.

CID 719690

PyList_Append() (called by PyArena_AddPyObject()) can fail because of a
MemoryError for example.

Patch from Sven Brauch.

and a full traceback including line number.

I've left a couple of them in: zlib (third-party lib), getaddrinfo.c
(doesn't include Python.h, and probably obsolete), _sre.c (legitimate
use for the re.LOCALE flag).

Fixed memory leak in error branch of parsestrplus. CID 715374 Variable s going out of scope leaks the storage it points to.