[regtests] some other things to improve

[Dmytro O. Redchuk]

Hi!

1. In "finger-chords-accidental.ly": "Scripts left of a chord avoid
accidentals."

Would be better to make a change:
 - <cis''-3 >
 + <cis''-3 e''> % or like that

I would be easier (without looking at the source) to say whether scripts
left of a *chord* really do avoid accidentals or not. (The first quarter
visually is not a chord; the second one is a chord but with no
accidental to check avoidance.)

2. In "alignment-vertical-manual-setting.ly": "pre system" --- should be
"per system".

3. In "optimal-page-breaking-hstretch.ly": looks like some
"horizontally" should be replaced with "vertically"?

-- 
Dmytro O. Redchuk

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