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Solution: specify 2.7 or >=3.5

Solution: prune zc.recipe.egg_

Solution: cleanup

Solution: sort packages to push site-packages at the end

Solution:
- better detection of need for upgrade
- more protection break by restarting only once

Solution: enable it on Travis, allowing failures

Solution: Remove it, mention `pip`

Solution: run coverage in containers on GH and Travis

Solution: run with Debian container on GH

Solution: pass environment properly, pass USERPROFILE

Solution: fix them

Solution: fix the testing suite speed hack that depends on
environment variables by avoiding - in env var name.

Solution: Add a GH workflow

Solution: monkeypatch `setuptools.packageIndex`
with code from `pip._internal`.

Because it depends on `pip._internal`, it is fragile.
As a first defense against breakage, imports are protected.
In case they would fail, buildout still works.

Solution: Use `pip install`

The meat of the change is in src/zc/buildout/easy_install.py

Some tests had to be refactored a bit to make them more robust.

`tox` is removed to avoid issues due to sharing the same directory
between different virtual environments; `Makefile` enriched to make
per python virtual envs depend on source files.

No need to be afraid of default Python install as we depend on `pip`.
`bootstrap.py` is gone as not needed anymore.

by patching `pkg_resources.Distribution`.

Run Travis tests in CentOS container.

Tests under Python 2.7 are temporarily disabled.

Centos container on Github Actions

register combine and report with atexit

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[actions] fix scripts and setuptools-master workflows

build for 2.7 was broken by new release of more-itertools

Use Github Actions for smoke tests

to generate scripts

run buildout and check which files are downloaded
and which eggs are installed

Fix simple typo: expecially -> especially

Fixes #484.

Fix typo.

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