GitLab

* Keep in-progress jobs once a test fails in Actions

By default, GitHub cancels all in-progress jobs if any `matrix` jobs fail in Actions. This PR will change the default to let all tests running in case one of them fails.

* Update unittest.yml

* Update unittest.yml

* Move unittest check to GitHub Actions

Tests are parallelized

* Delete tests.yml

* Update setup.py

* Create test_requirements.txt

* Update unittest.yml

* Update unittest.yml

* Update README.md

* Delete install_dependencies.sh

* Delete install_dependencies_python2.sh

* Update unittest.yml

* Move python2 check to GitHub Actions

* Delete python2.yml

* Rename azure/install_dependencies_python2.sh to ci/install_dependencies_python2.sh

* Create runnable_submodules.yml

* Delete runnable_submodules.yml

* Update runnable_submodules.yml

* Move tools check to GitHub Actions

* Delete tools.yml

* Move docs to github actions

* Delete docs.yml

* Create install_dependencies.sh (#311)

* Rename install_dependencies.sh to ci/install_dependencies.sh

* +x

* Update and rename pythonpackage.yml to flake8.yml

* Delete flake8.yml

* Update flake8.yml