Merge branch 'master' of git@sissource.ethz.ch:sispub/openbis.git

...as/maintenance-tasks/archiving-requested-task/groups.json

...ntenance-tasks/archiving-requested-task/plugin.properties

...e-plugins/openbis/1/dss/drop-boxes/archiving/archiving.py

...s/miscellaneous/multi-data-set-archiver/plugin.properties

...chiving/openbis_test_multi_data_set_archiving_openbis.sql

integration-tests/test_multi_data_set_archiving.py