EHN: Comfortable view of the version history.

CHANGELOG.md

misc/versioning_test_data.py

src/core/css/webcaosdb.css

src/core/js/caosdb.js

src/core/js/ext_bookmarks.js

src/core/js/ext_xls_download.js

src/core/js/webcaosdb.js

src/core/xsl/entity.xsl

test/core/js/modules/entity.xsl.js

test/core/js/modules/webcaosdb.js.js