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This PR makes it so we always build manylinux wheels, but only upload
them for git tags.
Highlights:
Move regular Linux Python builds outside the build matrix, for
conciseness.
Switch manylinux1 builds to manylinux2010 (they should still get the
manylinux1 tag if they're compatible, but they'll be built with a more
modern compiler toolchain).
Move twine upload from .manylinux.sh into .travis.yml's after_success,
right next to the twine upload used for Mac OS builds.
This means we can't short-circuit the builds with 'exit 0' in
before_install:, so overwrite the install: and script: sections too.
Move the 'docker pull' from .manylinux.sh into the install: section
so it's not empty.
Provide twine credentials via environment variables instead of
command-line/pypirc file.
Put related commands inside a single multiline if statement.
Use setup.py -q test (quiet build) instead of setup.py test -q (which
does nothing at all AFAICT).
This mirrors changes made to other zopefoundation packages tracked in
zopefoundation/meta#11.