Add a multi-select list of values to export in the export dialog, containing the surface depth and the properties available on the selected surfaces. IRAP/GRI files hold a single value per node, so each selected value is written to a separate file named <surface>--<value>. Exporting depth only keeps the plain surface name.
Property values are exported without resampling and require a regular surface with matching Nx and Ny. Values that cannot be exported are reported as warnings.
The export grid defaults are no longer rounded when they originate from a regular surface, and the grid rotation is added to the dialog. Both are required to export the surface without resampling.
The export folder was only applied to the dialog when a single regular surface was selected. Always seed the folder from the last used EXPORT_SURFACE directory by splitting setDefaults() into setExportFolder() and setGridDefaults().
A single non-regular surface now also falls into the bounding box estimation branch instead of keeping the 10x10 field defaults.
Magne Sjaastad
Kristian Bendiksen