- remove postorder
- remove protocol for automatically walking children based on visitor
  method return value; now only walks if there is no method

dict)

Also, wrap long line.

This (1) avoids thread unsafety whereby another thread could zap the
list while we were using it, and (2) now supports writing arbitrary
sequences of strings.

Added wrapping macros to dictobject.c, listobject.c, tupleobject.c,
frameobject.c, traceback.c that safely prevends core dumps
on stack overflow. Macros and functions in object.c, object.h.
The method is an "elevator destructor" that turns cascading
deletes into tail recursive behavior when some limit is hit.

with a twist: you have to define NO_STRICT_LIST_APPEND manually
to enable multi-arg append().

Noted by Michael Hudson.

Fix bad auto-indent I recently introduced when replacing the regexp that
could cause re to blow up:

    if or_any_other_block_opener:
        # one indenting comment line
            ^ cursor ended up at the caret (the bug)
        ^ but belongs here (the post-patch behavior)

(I did this under VC++ 5.0 -- hope this doesn't break anything.)

now defaults to -1, not to 0.  Passing an explicit zero doesn't split
or replace at all.

Marc-Andre Lemburg.

mode ('V') and in binary mode ('X').

mode ('V') and in binary mode ('X').

Written by Marc-Andre Lemburg.

the builtin codecs.  Written by Marc-Andre Lemburg.

Codec registry.

object.

unichr(); changed ord() to support Unicode strings; added new
exception UnicodeError; fixed a typo in doc string for buffer().

Lemburg.

(Unicode and raw Unicode).