- Removed redundant call to expandtabs in DocTestParesr.

- Improvements to interactive debugging support:
  - Changed the replacement pdb.set_trace to redirect stdout to the
    real stdout *only* during interactive debugging; stdout from code
    continues to go to the fake stdout.
  - When the interactive debugger gets to the end of an example,
    automatically continue.
  - Use a replacement linecache.getlines that will return source lines
    from doctest examples; this makes the source available to the
    debugger for interactive debugging.
- In test_doctest, use a specialized _FakeOutput class instead of a
  temporary file to fake stdin for the interactive interpreter.

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