Merge tag 'pybis-1.6.7' into develop

...neric/server/dss/plugins/sync/common/EntityRetriever.java

...eric/server/dss/plugins/sync/common/entitygraph/Node.java

...plugins/sync/harvester/synchronizer/MasterDataParser.java

...ugins/sync/harvester/synchronizer/ResourceListParser.java

integration-tests/source/systemtest/testcase.py

...e-plugins/openbis1/1/dss/drop-boxes/entity-reg/dropbox.py

.../test_openbis_sync/openbis_test_openbis_sync_openbis1.sql

integration-tests/test_openbis_sync.py

.../ethz/sis/openbis/generic/asapi/v3/dto/sample/Sample.java

pybis/src/python/HOWTO_UPLOAD_TO_PYPI

pybis/src/python/dist/PyBIS-1.6.7.tar.gz

pybis/src/python/pybis/__init__.py

pybis/src/python/pybis/semantic_annotation.py

pybis/src/python/setup.py