Added clientlib code to UI. Fixed cli imports.

gui/src/components/ApiDialogButton.js

nomad/app/__init__.py

nomad/app/api/common.py

nomad/app/api/repo.py

nomad/cli/__init__.py

nomad/cli/admin/__init__.py

nomad/cli/admin/admin.py

nomad/utils/__init__.py

tests/app/test_api.py

tests/normalizing/test_system.py

tests/test_cli.py

tests/test_parsing.py