Merge branch 'dev' into f-preview

.gitlab-ci.yml

CHANGELOG.md

misc/yaml_to_json.py

src/core/css/tour.css

src/core/js/caosdb.js

src/core/js/edit_mode.js

src/core/js/ext_references.js

src/core/js/ext_xls_download.js

src/core/js/form_elements.js

src/core/js/preview.js

src/core/js/tour.js

src/core/xsl/entity.xsl

src/core/xsl/navbar.xsl

src/core/xsl/query.xsl

src/ext/js/fileupload.js

test/core/html/form_elements_example_1.html

test/core/js/modules/edit_mode.js.js

test/core/js/modules/ext_map.js.js

test/core/js/modules/ext_references.js.js

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