Explicitly initialize the optional topXY member when constructing
RigWellPathFormation via aggregate initialization in the test helper,
avoiding a GCC -Wmissing-field-initializers warning.
Fixes#14882.
Parse depth-based FMU well-pick formations.csv files in RifWellPathFormationReader
and expose them as a project-level RimWellFormationsCollection of RimWellFormationsFile
objects. RigWellPathFormations becomes a value type with top/base MD and TVD depths
per formation, independent from the existing K-layer-index .lyr formation names.
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.
Magne Sjaastad