Small code tidy (alignment with prism-games).

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@6987 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/explicit/STPGModelChecker.java

@@ -27,12 +27,17 @@
 
 package explicit;
 
-import java.util.*;
+import java.util.BitSet;
+import java.util.List;
+import java.util.Map;
 
 import parser.ast.Expression;
 import parser.ast.ExpressionTemporal;
 import parser.ast.ExpressionUnaryOp;
-import prism.*;
+import prism.PrismException;
+import prism.PrismFileLog;
+import prism.PrismLog;
+import prism.PrismUtils;
 import explicit.rewards.STPGRewards;
 
 /**