[bug] MEI mapping errors in Hufnagel

I ran the same test I did for square notation with Hufnagel this time and found that all but two glyphs are working perfectly. Interestingly, `accidental.flat` and `accidental.natural` are both showing up fine! Here are the two culprits:

The `neume.podatus2` looks like this (the width isn't being taken into consideration):

When it should look like this:

And the `liquescent.up` looks like this:

When it should look like this: