Improved debug display

org.sat4j.core/src/main/java/org/sat4j/minisat/constraints/cnf/BinaryClause.java

@@ -158,11 +158,15 @@ public abstract class BinaryClause
         stb.append(Lits.toString(this.head));
         stb.append("["); //$NON-NLS-1$
         stb.append(this.voc.valueToString(this.head));
+        stb.append("@");
+        stb.append(this.voc.getLevel(this.head));
         stb.append("]"); //$NON-NLS-1$
         stb.append(" "); //$NON-NLS-1$
         stb.append(Lits.toString(this.tail));
         stb.append("["); //$NON-NLS-1$
         stb.append(this.voc.valueToString(this.tail));
+        stb.append("@");
+        stb.append(this.voc.getLevel(this.tail));
         stb.append("]"); //$NON-NLS-1$
         return stb.toString();
     }

org.sat4j.core/src/main/java/org/sat4j/minisat/constraints/cnf/WLClause.java

@@ -176,6 +176,8 @@ public abstract class WLClause implements Propagatable, Constr, Serializable {
             stb.append(Lits.toString(lit));
             stb.append("["); //$NON-NLS-1$
             stb.append(this.voc.valueToString(lit));
+            stb.append("@");
+            stb.append(this.voc.getLevel(lit));
             stb.append("]"); //$NON-NLS-1$
             stb.append(" "); //$NON-NLS-1$
         }
@@ -191,6 +193,8 @@ public abstract class WLClause implements Propagatable, Constr, Serializable {
             stb.append(mapper.map(LiteralsUtils.toDimacs(lit)));
             stb.append("["); //$NON-NLS-1$
             stb.append(this.voc.valueToString(lit));
+            stb.append("@");
+            stb.append(this.voc.getLevel(lit));
             stb.append("]"); //$NON-NLS-1$
             stb.append(" "); //$NON-NLS-1$
         }