[issue1521051] Allow passing DocTestRunner and DocTestCase in doctest

[Kostyantyn Leschenko]

Kostyantyn Leschenko added the comment:

I've updated patch to work with current trunk and added new params to doctest documentation.

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nosy: +Kostyantyn.Leschenko
Added file: http://bugs.python.org/file29714/doctest-configuration-1.diff

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