(backport from rev. 56833)

Fixes #1730114.
 (backport from rev. 56830)

 (backport from rev. 56797)

Fix gb18030 codec's bug that doesn't map two-byte characters on
GB18030 extension in encoding. (bug reported by Bjorn Stabell)

 (backport)

 (backport from rev. 56614)

 (backport from rev. 56611)

represent the result in a single character.

- be more strict about the build environment
- update some 3th party libraries

 (backport from rev. 56551)

 (backport from rev. 56451)

Avoid exception if there's a stray directory inside a Maildir folder.

The Maildir specification doesn't seem to say anything about this
situation, and it can happen if you're keeping a Maildir mailbox in
Subversion (.svn directories) or some similar system.  The patch just
ignores directories in the cur/, new/, tmp/ folders.

 (backport from rev. 56366)

 (backport from rev. 56364)

[ 1752723 ] email.message_from_string: initial line gets discarded

I added a test to assert that when the first line of text passed to
message_from_string() contains a leading space, the message ends up with the
appropriate FirstHeaderLineIsContinuationDefect on its defects list.

The bug is invalid.

Py_DECREF'd.

Fix for SF# 1649098: avoid zero-sized array declaration in structure.

of c_char_p and c_wchar_p has changed as a sideeffect.

Python tutorial.
 (backport from rev. 56306)

 (backport from rev. 56302)

with %G.
 (backport from rev. 56298)

 (backport from rev. 56296)

without handler.
 (backport from rev. 56293)

 (backport from rev. 56280)

when a users install GNU libtool early in his PATH

Backport of 56204.

console object, avoid crashing in that case.

 (backport from rev. 56143)

 (backport from rev. 56137)

 (backport from rev. 56129)

 (backport from rev. 56091)

 (backport from rev. 56084)

 (backport from rev. 56040)

 (backport from rev. 56038)