Release v1.6.0-rc1

• CSCFAIRMETA-493: [REM] Code and tests related to old auth proxy.
• CSCFAIRMETA-477: [ADD] Check if preferred identifier exists when harvested dataset is created.
• CSCFAIRMETA-318: [REM] Remove unnecessary code that was intended as a fix previously. The real solution was using additional query parameters so that ordering could be reliably determined by the db.
• CSCFAIRMETA-490: [ADD] Update schema files from tietomallit.suomi.fi
• CSCIDA-649: [ADD] Validation for checksum algorithm of file. Accepted algorithms are listed in settings.
• CSCFAIRMETA-219: [ADD] Expands file/datasets endpoint to include query parameter to get detailed output for files belonging to datasets
• CSCFAIRMETA-483: [ADD] Add 'preservation_state' filter. Keep old filter 'state'. Modify tests accordingly.
• CSCFAIRMETA-437: [ADD] Create new query parameter ?draft. Create feature switch for draft datasets. Save drafts without preferred identifier. Do not publish into publish into rabbitmq, rems or datacite.
• CSCFAIRMETA-292: [ADD] REMS handling on license change
• CSCFAIRMETA-387: [ADD] Service-level permissions to data catalogs (#533)
• CSCFAIRMETA-436: [ADD] Delete drafts immediately
• CSCFAIRMETA-433: [ADD] Draft datasets can be updated only by dataset owner (#544)
• CSCFAIRMETA-122: [ADD] README.md file to document testdata generation and running tests
• CSCFAIRMETA-432: [ADD] Draft datasets should only be retrievable by dataset owner
• CSCFAIRMETA-122: [ADD|FIX] Improve swagger generation instructions, fix old yaml loader bug