ModuleNotFoundError.

Cmd used to blindly chop off the last character of every input line.  If
the input reached EOF and there was no final new line, it would truncate
the last character of the last command.  This fix instead strips trailing
\r\n from the input lines.  While this is a small behavior change, it
should not break any working code, since feeding a '\r\n' terminated
file to Cmd would previously leave the \r's on the lines, resulting
in failed command execution.

I wrote the unit test in preparation for a PyOhio TeachMe session
run by Catherine Devlin, and we can thank Catherine and the PyOhio
session attendees for the fix.  I've added Catherine to the Acks file
for organizing and leading the TeachMe session, out of which we will
hopefully get some new contributors.

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r77185 | andrew.kuchling | 2009-12-31 10:17:05 -0600 (Thu, 31 Dec 2009) | 1 line

  Add some items
........
  r77186 | benjamin.peterson | 2009-12-31 10:28:24 -0600 (Thu, 31 Dec 2009) | 1 line

  update expat comment
........
  r77187 | andrew.kuchling | 2009-12-31 10:38:53 -0600 (Thu, 31 Dec 2009) | 1 line

  Add various items
........
  r77188 | benjamin.peterson | 2009-12-31 10:49:37 -0600 (Thu, 31 Dec 2009) | 1 line

  add another advancement
........
  r77262 | andrew.kuchling | 2010-01-02 19:15:21 -0600 (Sat, 02 Jan 2010) | 1 line

  Add a few items
........
  r77313 | benjamin.peterson | 2010-01-04 18:04:19 -0600 (Mon, 04 Jan 2010) | 1 line

  add a test about hashing array.array
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  r77317 | georg.brandl | 2010-01-05 12:14:52 -0600 (Tue, 05 Jan 2010) | 1 line

  Add Stefan.
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  r77331 | georg.brandl | 2010-01-06 11:43:06 -0600 (Wed, 06 Jan 2010) | 1 line

  Small fixes to test_cmd: fix signature of do_shell, remove duplicate import, add option to run the custom Cmd class.
........
  r77332 | georg.brandl | 2010-01-06 12:02:16 -0600 (Wed, 06 Jan 2010) | 7 lines

  #5991: let completion for the "help" command include help topics.

  This also simplifies the Cmd.get_names() method implementation; it was written
  at a time where dir() didn't consider base class attributes.
........
  r77333 | georg.brandl | 2010-01-06 12:26:08 -0600 (Wed, 06 Jan 2010) | 1 line

  #5950: document that zip files with comments are unsupported in zipimport.
........
  r77337 | r.david.murray | 2010-01-06 21:09:08 -0600 (Wed, 06 Jan 2010) | 3 lines

  Add -W to the 'basics', 'opt', and 'all' test runs so that we get verbose
  information if a failure happens.
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  r77338 | r.david.murray | 2010-01-06 22:04:28 -0600 (Wed, 06 Jan 2010) | 2 lines

  Fix inadvertent checkin of debug line.
........

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