Add optional arg to string methods strip(), lstrip(), rstrip().
The optional arg specifies characters to delete.

Also for UserString.

Still to do:

- Misc/NEWS
- LaTeX docs (I did the docstrings though)
- Unicode methods, and Unicode support in the string methods.

_PyObject_DebugMalloc:  explicitly cast PyObject_Malloc's result to the
target pointer type.

_PyObject_DebugDumpStats:  change decl of arena_alignment from unsigned
int to unsigned long.

This is for the 2.3 release only (it's new code).

(The real issue is whether modules can benefit from an alternate
implementation strategy rather than using a dictionary.  We should migrate
away from direct dictionary manipulation to allow more room for Jeremy to
flex the implementation with changes in globals lookup.)

Clean up the example of exporting a C-callable API from an extension module.
Add a hyperlink to a related section in the Python/C API reference.

PyModule_GetDict(), which is also more flexible: it does not assume that the
"module" is a real module.

Change a section title to fit in better.

The test function's signature should be

    test(methodname, input, output, *args)

but the output argument was omitted.  This caused all tests to fail,
because the expected output was passed as the initial argument to the
method call.  But because of the way the test works (it compares the
results for a regular string to the results for a UserString instance
with the same value, and it's OK if both raise the same exception) the
test never failed!

I've fixed this, and also cleaned up a few warts in the verbose
output.  Finally, I've made it possible to run the test stand-alone in
verbose mode by passing -v as a command line argument.

Now, the test will report failure related to zfill.  That's not my
fault, that's a legitimate problem: the string_tests.py file contains
a test for the zfill() method (just added) but this method is not
implemented.  The responsible party will surely fix this soon now.

- Added a debug class variable to enable parser debugging.

or v.v.

most of the work.  In particular, if the underlying realloc is able to
grow the memory block in place, great (this routine used to do a fresh
malloc + memcpy every time a block grew).  BTW, I'm not so keen here on
avoiding possible quadratic-time realloc patterns as I am on making
the debug pymalloc more invisible (the more it uses memory "just like"
the underlying allocator, the better the chance that a suspected memory
corruption bug won't vanish when the debug malloc is turned on).

prefix.  These symbols are private to the file, and the PYMALLOC_ gets
in the way (overly long code lines, comments, and error messages).

PyMem_{Del, DEL} doesn't work yet (compilation problems).

pyport.h:  _PyMem_EXTRA is gone.

pmem.h:  Repaired comments.  PyMem_{Malloc, MALLOC} and
PyMem_{Realloc, REALLOC} now make the same x-platform guarantees when
asking for 0 bytes, and when passing a NULL pointer to the latter.

object.c:  PyMem_{Malloc, Realloc} just call their macro versions
now, since the latter take care of the x-platform 0 and NULL stuff
by themselves now.

pypcre.c, grow_stack():  So sue me.  On two lines, this called
PyMem_RESIZE to grow a "const" area.  It's not legit to realloc a
const area, so the compiler warned given the new expansion of
PyMem_RESIZE.  It would have gotten the same warning before if it
had used PyMem_Resize() instead; the older macro version, but not the
function version, silently cast away the constness.  IMO that was a wrong
thing to do, and the docs say the macro versions of PyMem_xyz are
deprecated anyway.  If somebody else is resizing const areas with the
macro spelling, they'll get a warning when they recompile now too.

all the same within the #ifdef WITH_PYMALLOC block.

PyMalloc_ prefix and use PyObject_ instead.  I'm not sure about the
debugging functions.  Perhaps they should stay as PyMalloc_.

PyObject_Del and PyObject_GC_Del can now be used as a function
designators.