Missing links for MUNG OMR

[GregoireLamb]

Hello Elona !

Thank you very much for the dataset ! I'm working with MUsic Notation Graph and I realized that some objects lack links in the Parsed_by_page_omr_xml. For example, any type of flag is not linked to its notehead, and the same goes for accidentals. Is there a reason why they are not included? Would it be possible to add them somehow?

Thank you !