[publishing] Testing Lilypond 4.5

I spent most of yesterday morning building and testing lilypond
4.5.

I won’t be using it routinely yet, because there’s a very serious
bug in abc2ly, where it doesn’t any more translate the Key signature.

Update: they fixed that but, so I’ll probably be doing some more
testing, and then maybe starting to convert my setup to using the
current version.

This means abc2ly is unusable, since the notes are different for a
different key signature in lilypond and abc. That is, in lilypond an
F# is entered as fis no matter what the key signature is. But in ABC,
the note on the first space of a treble clef is entered as F, and the
key signature is what determines whether that note is sharped or not.
So an abc2ly that doesn’t know what the key signature is, isn’t going
to have the right notes, and a workaround that just edits the key
signature in isn’t.

But just so you can see what they’re up to, compare this piece

from 2.0.2 with the same piece from
2.5.19

Let me know what you think.