Compositor:
Muting option to temporary disable/enable nodes.
Hotkey: press M on selection. It toggles.
Note: no menu entry yet, and drawing style could be tweakered...
a premul image but that doesn't work correct. Now it depremuls and
premuls again around the gamma correction. Better solution might be
possible, but this gives compatible results.
Crashes in composite; caused by bad bad bug in freeing "passed on" buffers,
only happens with option "Free unused" set though.
Appeared to be mixup of variable names. Code changes with 2 bytes... :)