[issue8637] Add MANPAGER envvar to specify pager for pydoc

[Roundup Robot]

Roundup Robot added the comment:

New changeset dea9f9b5582b by doko in branch 'default':
- Issue #8637: Honor a pager set by the env var MANPAGER (in preference to
https://hg.python.org/cpython/rev/dea9f9b5582b

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