error handler, instead of writing to the C stderr file in utf-8

ports of IronPython tests.  Thanks Gregory Nofi.

unquote is duplicated in the two files to avoid a circular reference.
(This is fixed in Python3.)  Updates keep getting made to the public unquote
without fixing the urlparse one, however, so this fix syncs the two
and adds a comment to both to make sure changes are applied to both.

ERROR_MORE_DATA, requiring another call to get the remaining data.

Patch by Daniel Stutzbach

#8016: add the CP858 codec (approved by Benjamin).  (Also add CP720 to the tests, it was missing there.)

Fix default value for version help. Approved by Benjamin on python-dev: http://mail.python.org/pipermail/python-dev/2010-May/100231.html

argparse documentation updates (including updates to optparse and getopt documentation that were promised in the PEP)

svn+ssh://pythondev@svn.python.org/sandbox/trunk/2to3/lib2to3

........
  r80937 | benjamin.peterson | 2010-05-07 14:10:58 -0500 (Fri, 07 May 2010) | 1 line

  remove redundant unicode call
........
  r81478 | benjamin.peterson | 2010-05-22 13:47:39 -0500 (Sat, 22 May 2010) | 1 line

  ensure doctests have some future_features
........

Rememder: don't touch the code just before a commit

 * Fix seek() method of codecs.open(), don't write the BOM twice after seek(0)
 * Fix reset() method of codecs, UTF-16, UTF-32 and StreamWriter classes
 * test_codecs: use "w+" mode instead of "wt+". "t" mode is not supported by
   Solaris or Windows, but does it really exist? I found it the in the issue.

after seek(0)

than strict