[issue8637] Add MANPAGER envvar to specify pager for pydoc

[Martin Panter]

Martin Panter added the comment:

Matthias: your change causes pydoc to raise KeyError if I set MANPAGER but not PAGER. I’m guessing you intended something else?

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nosy: +martin.panter
versions: +Python 3.6 -Python 3.3

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<http://bugs.python.org/issue8637>
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