v1.2.0

Changed:

• use sauvola-ms-split as default impl (method)
• default to win-size=0 which now equals odd DPI value of image
• set pcGtsId in PAGE-XML, ht @mikegerber, #63
• images are written to the same output_file_grp as the PAGE-XML, OCR-D/core#505

Added:

• parameter dpi to override image meta-data DPI