Changed:
• bashlib: check bash version to be >= 4.4, #445, OCR-D/ocrd_olena#30
• ocrd workspace add supports -C/--check-file-exists to validate that FNAME is an existing local file, #495
• OcrdFile constructor accepts ID parameter
• model_factory.page_from_image now sets the @pcGtsId attribute tot the file's @id, #378
• WorkspaceValidator: check pc:PcGts/@pcGtsId == mets:file/@id, #378
• OcrdFile constructor: removed long-obsolete instance parameter
• METS: reorder elements according to schema in empty METS, #487