Merged revisions 83325,83328,83341 via svnmerge from

Merged revisions 83325,83328,83341 via svnmerge from
svn+ssh://svn.python.org/python/branches/py3k

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  r83325 | georg.brandl | 2010-07-31 11:37:03 +0200 (Sa, 31 Jul 2010) | 1 line

  Copy Sun-specific inclusion of <alloca.h> from 2.7 maint to trunk; it seems to not have been merged to py3k.
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  r83328 | raymond.hettinger | 2010-07-31 12:14:41 +0200 (Sa, 31 Jul 2010) | 1 line

  Document how to change OrderedDict update order from first to last.
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  r83341 | georg.brandl | 2010-07-31 13:40:07 +0200 (Sa, 31 Jul 2010) | 1 line

  #9430: document timedelta str() and repr().
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