page to text: rewrite
page to text: rewrite

- supports recursive ReadingOrder (can be disabled via param order=document)
- supports setting the hierarchy level to extract from (default level=highest behaves as before)
- supports setting line/paragraph boundary strings (params lb and pb)
UB-Mannheim/ocr-fileformat,UB-Mannheim/ocr-fileformat,UB-Mannheim/ocr-fileformat,UB-Mannheim/ocr-fileformat