Needs to be backported to 2.6 and forward ported to 3.0 and 3.1.

Improve the appearance and flow of the References section -- it used
to have a box around it that wasn't distinct from the preceding code
boxes and it had a weird bolding pattern and hanging indents that
made the section disproportionately large.

with a mapping.  Makes Counter() idempotent, makes update()
API the same as Counter.__init__(), makes a more readable
repr, makes the API more dict-like, and allows Steven
Bethard's update() example to work.

Now the slot is filled with a function that always raises.

Will not backport: extensions compiled with 2.6.x would not run on 2.6.0.

Add tests for invalid format specifiers in strftime, and for handling of invalid file descriptors in the os module.

to better describe the signed vs unsigned return value behavior on
different platforms and versions of python.  Mention the workaround to
make them all return the same thing by using & 0xffffffff.

Fixes issue4903.

Also needs to be merged into release26-maint, release30-maint, & py3k.

  biarch systems. Try to rely on ldconfig only, without using objdump and gcc.

Minor documentation changes cross-referencing NullHandler to the documentation on configuring logging in a library.