* Add --entrypoint to run --help
* Set docker hub registry registry-1.docker.io
* Fix repository name in search --list-tags
* Improve tests: udocker_test.sh and udocker_test-run.sh
* Documentation revision and improvements
* Add licenses and licenses notice to documentation
* Add test instructions
* Issues with --allow-root in Python 3.8
* Add security policy SECURITY.md
* Remove old Python 2 tests
* Fix configuration hierarchy, configuration files
* Update documentation: README, user and install manuals
* Fix sqa and config