Feature/morten.ofstad/segy sample units option

Merged Morten Ofstad requested to merge feature/morten.ofstad/SEGYSampleUnitsOption into master
  • Added definitions of known units and some other things to KnownMetadata.
  • Make the const char* version of SetMetadataString public since this is normal to use with strings from KnownMetadata.
  • Added --sampleUnit and --crsWkt options to SEGYImport.
  • Added metadata for the SurveyCoordinateSystem unit.

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