GitLab

matplotlib accepts a StringIO for Python 2 but a wants a BytesIO
with Python 3

Type is float64 so default value should be numerical.

Python 3 is less forgetful and doesn't allow the > comparison between
a string and a number.

Docker update

See merge request !17

"docker-py" is now just "docker"

List environment packages

See merge request !16

This assumes that the environment are setup using conda.

This makes it more clear than a generic Exception.

The Gitlab runner does not provide any tty as it is not
interactive.

This allows to run the test faster as it was only used as a benchmark.

This database will also be removed in the future.