Gulf coast margin zSed handlers and config updates

• Added Gulf Coast zSed to conus model and updated GmmInput and Site to carry value
  • Updated Chapman & Guo (2021) NGA-East GMMs to use zSed instead of z2p5
  • Resolves #125 (closed)
• Config: Reinstated DSF sigma flag
  • See #110
• Config: Added useSiteData flag
  • See nshmp-haz#509 (closed)
  • Resolves #144 (closed)

src/main/java/gov/usgs/earthquake/nshmp/calc/CalcConfig.java

@@ -221,6 +221,13 @@ public final class CalcConfig {
      */
     public final double gmmDampingRatio;
 
+    /**
+     * Whether or not {@link GroundMotionModel} (GMM) sigmas are also modified
+     * according to the Rezaeian et al. (2014) model when applying damping
+     * scaling factors (DSF).
+     */
+    public final boolean gmmDampingSigma;
+
     /**
      * Factor by which the aleatory variability (sigma) for all GMMs should be
      * scaled.
@@ -251,6 +258,7 @@ public final class CalcConfig {
       this.sourceTypes = b.sourceTypes;
       this.vs30s = b.vs30s;
       this.gmmDampingRatio = b.gmmDampingRatio;
+      this.gmmDampingSigma = b.gmmDampingSigma;
       this.gmmSigmaScale = b.gmmSigmaScale;
       this.valueFormat = b.valueFormat;
 
@@ -293,6 +301,7 @@ public final class CalcConfig {
       Set<SourceType> sourceTypes;
       Set<Double> vs30s;
       Double gmmDampingRatio;
+      Boolean gmmDampingSigma;
       Double gmmSigmaScale;
       ValueFormat valueFormat;
       Map<Imt, double[]> customImls;
@@ -312,6 +321,7 @@ public final class CalcConfig {
             RezaeianDamping_2014.DAMPING_RATIO_RANGE,
             "gmmDampingRatio",
             gmmDampingRatio);
+        checkNotNull(gmmDampingSigma);
         checkNotNull(gmmSigmaScale);
         checkInRange(
             Range.closed(0.5, 1.0),
@@ -330,6 +340,7 @@ public final class CalcConfig {
         this.sourceTypes = that.sourceTypes;
         this.vs30s = that.vs30s;
         this.gmmDampingRatio = that.gmmDampingRatio;
+        this.gmmDampingSigma = that.gmmDampingSigma;
         this.gmmSigmaScale = that.gmmSigmaScale;
         this.valueFormat = that.valueFormat;
         this.customImls = that.customImls;
@@ -357,6 +368,9 @@ public final class CalcConfig {
         if (that.gmmDampingRatio != null) {
           this.gmmDampingRatio = that.gmmDampingRatio;
         }
+        if (that.gmmDampingSigma != null) {
+          this.gmmDampingSigma = that.gmmDampingSigma;
+        }
         if (that.gmmSigmaScale != null) {
           this.gmmSigmaScale = that.gmmSigmaScale;
         }