Miyao can't find staves if the lines on the folio are too spotty

@kyrieb-ekat described it in a comment:

> Have chewed through this more, broken down in https://github.com/DDMAL/Rodan/issues/1291 . It is because the lines get interrupted so frequently they aren't counted as lines; so if it's looking for four lines that's easier than looking for five/more likely to find coordinates and data points for four lines that five. There's a separate issue in the mei encoding process where that's designed 1) for neumes and 2) for four staves, but that's a downstream/separate issue. I found that a separate approach which basically broadened the acceptable range of variance (like, if the page is bent or if some ink is faded) it will connect the ensuing staffline once the ink rethickens/colors/etc as part of the previous staffline nearish that same x coordinate within a degree of variance. Staff Finding is super super strict about this, apparently, which has been causing issues.

And written a longer issue about it here: https://github.com/DDMAL/Rodan/issues/1291