Regression comparisons: something rotten

[Alexander Deubelbeiss]

In http://lilypond.org/test/v2.11.40-1/compare-v2.11.39-1/index.html some of 
the regression tests show log files instead of notation images. Here's the list:

volta-broken-left-edge
chord-names-languages
instrument-name
multi-measure-rest-instr-name
profile-property-access
instrument-name-dynamic
quote-cue-during
alignment-vertical-spacing
quote-during
tag-filter
quote
instrument-name-markup
clip-systems
instrument-switch
drums
quote-grace
instrument-name-hara-kiri
prefatory-spacing-matter
fret-boards
option-help
instrument-name-partial

Nearly all of these do have images on the collated-files page, so the problem 
seems to be with the comparison setup rather than with actual tests breaking on 
the current version.

The one that does not have a collated-files image is option-help.ly -- should 
there be one, or is the result written to the console for that test?
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