Issue #1285086: Speed up urllib.parse functions: quote, quote_from_bytes, unquote, unquote_to_bytes.

Recorded merge of revisions 81265 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r81265 | florent.xicluna | 2010-05-17 15:35:09 +0200 (lun, 17 mai 2010) | 2 lines

  Issue #1285086: Speed up urllib.quote and urllib.unquote for simple cases.
........