Introduced custom percentile handling for ensemble statistics:
- Added "CUSTOM" statistics type and percentile field to RifEclipseSummaryAddress
- Refactored RimEnsembleStatisticsCase to store and compute arbitrary percentiles
- RimEnsembleStatistics now parses custom percentiles from UI input
- RimEnsembleCurveSet and related interfaces updated to handle custom percentile curves and labels
- Hashing and statistics calculations now include custom percentiles for cache validity
Magne Sjaastad
Kristian Bendiksen