Added ComposedBlock level to Alto output
Added ComposedBlock level to Alto output

UB-Mannheim/tesseract,UB-Mannheim/tesseract,stweil/tesseract,tesseract-ocr/tesseract,stweil/tesseract,stweil/tesseract,amitdo/tesseract,tesseract-ocr/tesseract,amitdo/tesseract,amitdo/tesseract,amitdo/tesseract,stweil/tesseract,tesseract-ocr/tesseract,stweil/tesseract,tesseract-ocr/tesseract,amitdo/tesseract,UB-Mannheim/tesseract,tesseract-ocr/tesseract,UB-Mannheim/tesseract,UB-Mannheim/tesseract