Merge branch 'im_und_export' into 'master'

.docker/Dockerfile

.gitignore

.gitlab-ci.yml

integrationtests/full_test/example_table.csv

integrationtests/full_test/test.sh

integrationtests/full_test/test_im_und_export.py

integrationtests/single_tests/test_crawler.py

setup.py

src/caosadvancedtools/converter/labfolder_api.py

src/caosadvancedtools/export_related.py

src/caosadvancedtools/import_from_xml.py

src/caosadvancedtools/pandoc_header_tools.py

src/caosadvancedtools/table_converter.py

unittests/test_cache.py

unittests/test_read_md_header.py