Add some debugging notes.
Add some debugging notes.

Sigil-Ebook/sigil-gumbo,luoxn28/gumbo-parser,f123h456/gumbo-parser,abc00/gumbo-parser,aleksandaratanasov/gumbo-parser,abc00/gumbo-parser,mcanthony/gumbo-parser,vmg/gumbo-parser,f123h456/gumbo-parser,Sigil-Ebook/sigil-gumbo,urandu/gumbo-parser,google/gumbo-parser,abc00/gumbo-parser,luoxn28/gumbo-parser,abc00/gumbo-parser,vmg/gumbo-parser,lvchao0428/gumbo-parser,lvchao0428/gumbo-parser,urandu/gumbo-parser,mcanthony/gumbo-parser,google/gumbo-parser,mcanthony/gumbo-parser,f123h456/gumbo-parser,urandu/gumbo-parser,kevinhendricks/gumbo-parser,google/gumbo-parser,abc00/gumbo-parser,mcanthony/gumbo-parser,luoxn28/gumbo-parser,Sigil-Ebook/sigil-gumbo,urandu/gumbo-parser,urandu/gumbo-parser,luoxn28/gumbo-parser,lvchao0428/gumbo-parser,google/gumbo-parser,vmg/gumbo-parser,aleksandaratanasov/gumbo-parser,luoxn28/gumbo-parser,lvchao0428/gumbo-parser,lvchao0428/gumbo-parser,Sigil-Ebook/sigil-gumbo,google/gumbo-parser,f123h456/gumbo-parser,mcanthony/gumbo-parser,kevinhendricks/gumbo-parser,f123h456/gumbo-parser,aleksandaratanasov/gumbo-parser,kevinhendricks/gumbo-parser,vmg/gumbo-parser,aleksandaratanasov/gumbo-parser,aleksandaratanasov/gumbo-parser,kevinhendricks/gumbo-parser,kevinhendricks/gumbo-parser,Sigil-Ebook/sigil-gumbo