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

[ci skip]

[ci skip]

[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.

[ci skip]

[ci skip]

Avoid DeprecationWarning: 'U' mode is deprecated (Version 2)

Now the deprecation warning itself is fixed, we no longer need to
suppress it to have the tests pass.

Add a RENormalizer so the easy_install.txt will be happy with scripts
generated on Python 2 (using open(..., 'U')) and on Python 3 (using just
open(...)).

This was suggested by @sallner.

Python 3.7 began warning about open's 'U' mode. Universal newline mode (newline=None) is default in Python 3 so avoid specifying it on Python 3.

Update Trove classifiers and URL

- update list of supported python versions
- point to github instead of the old cheeseshop site

[ci skip]

[ci skip]

document query command

[ci skip]

[ci skip]

add a `query` command

as suggested by @leorochael