Possibly breaking change

• File names for documents downloaded from CTIS now include the document type and use different separators (e.g., "parts2auth - SbjctInfaICF - ..." as abbreviation of "Subject information and informed consent form (for publication)", was previously "parts2auth_...")

Improvements

• Add retrieval of historic versions of trial records from CTGOV2 (automatically retrieved from CTIS, not available for other registers)
• Added typing of newly appearing fields from CTIS
• Increase testing coverage to 93.7% locally
• Added missing CI for the combination of DuckDB and CTGOV2

Bug fixes

• Correct typing certain fields as (lists of) integers
• Handle marginal case in dbGetFieldsIntoDf()
• Changed unlink of intermediate files
• Minor vignettes corrections