Project: bug fix: isLoadingProject was not set to false when an exception occurred during project loading
OfxChoiceInstance: check that the value set is not negative
OfxKeyFrame: getKeyTime() now returns early if the key index is negative
Knob::setValue: check that the dimension is positive
ComboBox: add warnings, because strange things are happening here
Choice_KnobGui: add warnings and requests for comments for @MrKepzie
comment unused signal