typing: induce pytype to use the standard `attr` instead of the vendored copy
What was previously happening with the vendored copy was that pytype would stub
out all(?) classes that were decorated with `@attr.s` as `Any`. After this, we
get a ton of classes defined, and numerous fields and methods now have proper
types.
Mercurial
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Mercurial is a fast, easy to use, distributed revision control tool
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Basic install::
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
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