Lib work

Updates for grid sources

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

@@ -111,7 +111,7 @@ public final class CalcConfig {
   public static Builder copyOf(CalcConfig config) {
     Builder b = new Builder();
     if (config.resource.isPresent()) {
-      b.resource = config.resource.get();
+      b.resource = config.resource.orElseThrow();
     }
     b.hazard.copy(config.hazard);
     b.siteData.copy(config.siteData);
@@ -1237,7 +1237,7 @@ public final class CalcConfig {
   public String toString() {
     return new StringBuilder("Calc Config: ")
         .append(resource.isPresent()
-            ? resource.get().toAbsolutePath().normalize()
+            ? resource.orElseThrow().toAbsolutePath().normalize()
             : "(from defaults)")
         .append(hazard.asString())
         .append(deagg.asString())