Restore lost source of acid-image test, increase framerate and reduce number of screenshots to one
Speed up a few acid tests
Remove acid-buttons tests

These don't test anything that's not covered by more dedicated tests
Speed up acid-child test and remove one screenshot
Remove acid-click-0 test

Doesn't test anthing, really, as the scripted behavior isn't triggered at all
Speed up acid-clip tests

By removing acid-clip-bug, which tests a subset of acid-clip, and speeding up acid-clip-3.
Remove one screenshot from acid-color
Remove acid-gc

Taking a screenshot of the first frame of this doesn't test the slightest thing.
Remove acid-image-2

Doesn't test anything not covered elsewhere. Multiple times.
Speed up acid-large
Speed up acid-mask and remove one screenshot
Remove acid-mask-0

Redundant
Remove acid-mouse and acid-mouse-0

These don't test anything, really.
Remove acid-sh

Redundant
Add screenshot to acid-small

Having two screenshots is actually useful here.
Remove acid-stroke-1

Redundant
Remove screenshot from acid-text-6
Take screenshots earlier in acid-clip-3