This lets us use the natural location for .coveragerc

By not actually recording anything for the tests. Presumably because they're executed as scripts, not as gevent.tests.whatever.

Travis is reporting src/gevent/test__* as uncovered, for some reason, but I don't get that locally.

Need to use an editable install on appveyor to find our test files; should probably loosen that restriction for downstream [skip travis]

In preperation for its removal.

Fixes #1305.

Write modified module source to a tempfile so we get correct tracebacks.

See https://ci.appveyor.com/project/denik/gevent/builds/20122331/job/9uowlkm47ayqwkxx#L1800

Fixes #1306

There's probably some sort of performance penalty, but we don't run all that many monkey files (22 or so), and they take long enough that I suspect its lost in the overhead.

Find greenlets in Cython code, keeping the GIL.

Mostly (hopefully) fixes #1302

Drop the deprecated ability to use absolute paths when giving an importable setting

This is to help diagnose issues like https://github.com/gevent/gevent/issues/1296

Drop `sudo` from our Travis config, following current recommendation