do not deliver metadatacontainertypes from crud, but remove them silently
this will make the metadata objects retrieved from crud via python-clients compatible with import/export and search results. crud will also do with API v2
this means that tgclients shall read and write the <object/>
by default. the clients shall be able to deal with metadatacontainertypes nonetheless, for backwards compatibility
Edited by Ubbo Veentjer