Merge branch 'v0.8.0' into encyclopedia

docs/archive.rst

docs/index.rst

docs/reference.rst

docs/upload.rst

examples/client.py

gui/package.json

gui/public/index.html

gui/public/pace.css

gui/src/components/About.js

gui/src/components/App.js

gui/src/components/FAQ.js

gui/src/components/LoginLogout.js

gui/src/components/Markdown.js

gui/src/components/UserdataPage.js

gui/src/components/about.afdesign

gui/src/components/about.svg

gui/src/components/api.js

gui/src/components/search/PeriodicTable.js

gui/src/components/search/QuantityHistogram.js

gui/src/components/search/Search.js