v2.26.0

Added:

• ocrd_utils: functions for scaling images, #707

Changed:

• OcrdFile: should only ever be instantiated in the context of OcrdMets, #324, #714
• Logging outputs to STDERR not STDOUT, OCR-D/spec#183, #713, #667

Fixed:

• ocrd workspace merge: handle file_grp parameter, #715
• ocrd workspace merge: explicit --copy-files was --no-copy-files, #715
• ocrd resmgr: Fix tesseract URLs, #721