doctest cannot compile finally

^ note that the formatter ruins the indentation, which does appear to be correct in the doctest. This issue is also in the pyflakes-doctest script. Two indenpendent implementation have the same issue.

DocTestParser.parse() is returning the second part of the block indented. DocTestParser() knows that >>> starts a block and that ... is subordinate and thus indented. However, changing the example doctest to ">>> finally:' causes the test to fail.

This leads me to wonder if the finally is really running in the examples in the problematic doctest. In the cases I see in the test, we could use the 'with' statement instead, or rewrite the code as a function that will be treated in a manner we expect.

I know how to hack the checker to compile the 'finally:' line, but I think it is better for us to not second guess the parser(). The doctest is bad and we should rewrite.

There is a simple fix for this. Do not use _disambuguate_doctest() during __init__ because it mutates the continuation lines. Is this still needed by the doctest reformatter? The worst doctests were clean up, most that could have their continuation lines reformatted would be better rewritten. Consider removing the method.