Palette colors for formations missing from the legend were assigned by position in the per-well zone list, so the same formation could get different colors for different wells. Assign them by order of first appearance in the formations file instead.
Return values instead of out-parameters, and move the error dialog
from the reader to the importer so the reader can be unit tested.
Fix crash in level detection when erasing while iterating.
The object is immutable after construction and small, so reference
counting via cvf::Object adds nothing. Store it by value and use
std::optional where it may be absent.
Magne Sjaastad
jonjenssen
Gaute Lindkvist