Fix #17197: profile/cProfile modules refactored so that code of run() and runctx() utility functions is not duplicated in both modules.

Merged revisions 82805-82806,83523-83527,83536,83538,83542,83546-83548,83550-83555,83558,83560 via svnmerge from
svn+ssh://svn.python.org/python/branches/py3k

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  r82805 | georg.brandl | 2010-07-11 11:42:10 +0200 (So, 11 Jul 2010) | 1 line

  #7935: cross-reference to ast.literal_eval() from eval() docs.
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  r82806 | georg.brandl | 2010-07-11 12:22:44 +0200 (So, 11 Jul 2010) | 1 line

  #9223: link to Command class reference, and move Command interface docs nearer to class docs.
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  r83523 | georg.brandl | 2010-08-02 14:06:18 +0200 (Mo, 02 Aug 2010) | 1 line

  #9209 and #7781: fix two crashes in pstats interactive browser.
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  r83524 | georg.brandl | 2010-08-02 14:20:23 +0200 (Mo, 02 Aug 2010) | 1 line

  #9428: fix running scripts from profile/cProfile with their own name and the right namespace.  Same fix as for trace.py in #1690103.
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  r83525 | georg.brandl | 2010-08-02 14:36:24 +0200 (Mo, 02 Aug 2010) | 1 line

  Get rid of spurious "threading" entries in trace output.
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  r83526 | georg.brandl | 2010-08-02 14:40:22 +0200 (Mo, 02 Aug 2010) | 1 line

  Fix softspace relic.
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  r83527 | georg.brandl | 2010-08-02 14:48:46 +0200 (Mo, 02 Aug 2010) | 1 line

  #3821: beginnings of a trace.py unittest.
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  r83536 | georg.brandl | 2010-08-02 19:49:25 +0200 (Mo, 02 Aug 2010) | 1 line

  #8578: mention danger of not incref'ing weak referenced object.
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  r83538 | georg.brandl | 2010-08-02 20:10:13 +0200 (Mo, 02 Aug 2010) | 1 line

  #6928: fix class docs w.r.t. new metaclasses.
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  r83542 | georg.brandl | 2010-08-02 20:56:54 +0200 (Mo, 02 Aug 2010) | 1 line

  Move test_SimpleHTTPServer into test_httpservers.
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  r83546 | georg.brandl | 2010-08-02 21:16:34 +0200 (Mo, 02 Aug 2010) | 1 line

  #7973: Fix distutils options spelling.
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  r83547 | georg.brandl | 2010-08-02 21:19:26 +0200 (Mo, 02 Aug 2010) | 1 line

  #7386: add example that shows that trailing path separators are stripped.
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  r83548 | georg.brandl | 2010-08-02 21:23:34 +0200 (Mo, 02 Aug 2010) | 1 line

  #8172: how does one use a property?
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  r83550 | georg.brandl | 2010-08-02 21:32:43 +0200 (Mo, 02 Aug 2010) | 1 line

  #9451: strengthen warning about __*__ special name usage.
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  r83551 | georg.brandl | 2010-08-02 21:35:06 +0200 (Mo, 02 Aug 2010) | 1 line

  Remove XXX comment that was displayed.
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  r83552 | georg.brandl | 2010-08-02 21:36:36 +0200 (Mo, 02 Aug 2010) | 1 line

  #9438: clarify that constant names also cannot be assigned as attributes.
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  r83553 | georg.brandl | 2010-08-02 21:39:17 +0200 (Mo, 02 Aug 2010) | 1 line

  Remove redundant information.
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  r83554 | georg.brandl | 2010-08-02 21:43:05 +0200 (Mo, 02 Aug 2010) | 1 line

  #7280: note about nasmw.exe.
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  r83555 | georg.brandl | 2010-08-02 21:44:48 +0200 (Mo, 02 Aug 2010) | 1 line

  #8861: remove unused variable.
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  r83558 | georg.brandl | 2010-08-02 22:05:19 +0200 (Mo, 02 Aug 2010) | 1 line

  #8648: document UTF-7 codec functions.
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  r83560 | georg.brandl | 2010-08-02 22:16:18 +0200 (Mo, 02 Aug 2010) | 1 line

  #9087: update json docstrings -- unicode and long do not exist anymore.
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svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r83524 | georg.brandl | 2010-08-02 14:20:23 +0200 (lun., 02 août 2010) | 1 line

  #9428: fix running scripts from profile/cProfile with their own name and the right namespace.  Same fix as for trace.py in #1690103.
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  r84776 | florent.xicluna | 2010-09-13 18:35:02 +0200 (lun., 13 sept. 2010) | 1 line

  Make test.regrtest.__file__ absolute, this was not always the case when running profile or trace, for example.  (issue #9323)
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#9428: fix running scripts from profile/cProfile with their own name and the right namespace.  Same fix as for trace.py in #1690103.

I like this because it makes the code shorter! :-)

SF patch# 1755176 by Amaury Forgeot d'Arc.

There's one major and one minor category still unfixed:
doctests are the major category (and I hope to be able to augment the
refactoring tool to refactor bona fide doctests soon);
other code generating print statements in strings is the minor category.

(Oh, and I don't know if the compiler package works.)

Based on lsprof (patch #1212837) by Brett Rosen and Ted Czotter.
With further editing by Michael Hudson and myself.
History in svn repo: http://codespeak.net/svn/user/arigo/hack/misc/lsprof

* Module/_lsprof.c is the internal C module, Lib/cProfile.py a wrapper.
* pstats.py updated to display cProfile's caller/callee timings if available.
* setup.py and NEWS updated.
* documentation updates in the profiler section:
   - explain the differences between the three profilers that we have now
   - profile and cProfile can use a unified documentation, like (c)Pickle
   - mention that hotshot is "for specialized usage" now
   - removed references to the "old profiler" that no longer exists
* test updates:
   - extended test_profile to cover delicate cases like recursion
   - added tests for the caller/callee displays
   - added test_cProfile, performing the same tests for cProfile
* TO-DO:
   - cProfile gives a nicer name to built-in, particularly built-in methods,
     which could be backported to profile.
   - not tested on Windows recently!