2.17.10 regtests

[Phil Holmes]

I've just whiled away a happy few minutes looking at the regtests.  There 
are quite a number of changes, I think mostly based on Mike's latest 
horizontal skylining.  There are some that concern me in particular:

finger-chords.ly: I think the vertical positioning is now wrong.

ambitus-with-ligature.ly: I don't know why there is now a bracket ligature 
above the notes

tuplet-bracket-avoid-fingering.ly - too snug?

I'll raise a regression for each of these unless I'm told they're OK by the 
responsible dev.

--
Phil Holmes