limit by max/min value

pdb-ui/src/main/java/org/lucares/pdbui/PlotSettingsTransformer.java

@@ -57,6 +57,10 @@ class PlotSettingsTransformer {
 			return Limit.FEWEST_VALUES;
 		case MOST_VALUES:
 			return Limit.MOST_VALUES;
+		case MAX_VALUE:
+			return Limit.MAX_VALUE;
+		case MIN_VALUE:
+			return Limit.MIN_VALUE;
 		default:
 			throw new IllegalStateException("unhandled enum: " + limitBy);
 		}

pdb-ui/src/main/java/org/lucares/pdbui/domain/LimitBy.java

@@ -1,5 +1,5 @@
 package org.lucares.pdbui.domain;
 
 public enum LimitBy {
-	NO_LIMIT, MOST_VALUES, FEWEST_VALUES
+	NO_LIMIT, MOST_VALUES, FEWEST_VALUES, MAX_VALUE, MIN_VALUE
 }