Additional functionality for SEGYImport
- Scan files for multi-file SEGY
- 2D SEGY
- Offset-sorted prestack SEGY
- Crossline-sorted SEGY
- Options to enable VDS azimuth and mutes channels
- Options to set VDS attribute name and unit
- Fix prestack sparse gather respacingbly need to pull in SEGYValueRangeEstimator to avoid code duplication in analyzeSegment/analyzePrimaryKey