Adjusted version in POM an files

Author: czengler

README.md

@@ -1,4 +1,4 @@
-[![wercker status](https://app.wercker.com/status/24c4765f3a0d79520ad80a1e4c20cfa2/s/master "wercker status")](https://app.wercker.com/project/bykey/24c4765f3a0d79520ad80a1e4c20cfa2) [![Coverage Status](https://coveralls.io/repos/logic-ng/LogicNG/badge.svg?branch=master&service=github)](https://coveralls.io/github/logic-ng/LogicNG?branch=master) ![License](https://img.shields.io/badge/license-Apache%202-blue.svg) ![Version](https://img.shields.io/badge/version-1.5.0-ff69b4.svg)
+[![wercker status](https://app.wercker.com/status/24c4765f3a0d79520ad80a1e4c20cfa2/s/master "wercker status")](https://app.wercker.com/project/bykey/24c4765f3a0d79520ad80a1e4c20cfa2) [![Coverage Status](https://coveralls.io/repos/logic-ng/LogicNG/badge.svg?branch=master&service=github)](https://coveralls.io/github/logic-ng/LogicNG?branch=master) ![License](https://img.shields.io/badge/license-Apache%202-blue.svg) ![Version](https://img.shields.io/badge/version-1.5.1-ff69b4.svg)
 
 <img src="https://github.com/logic-ng/LogicNG/blob/master/doc/logo/logo_big.png" alt="logo" width="300">
 
@@ -19,7 +19,7 @@ LogicNG is released in the Maven Central Repository.  To include it just add
 <dependency>
   <groupId>org.logicng</groupId>
   <artifactId>logicng</artifactId>
-  <version>1.5.0</version>
+  <version>1.5.1</version>
 </dependency>
 ```
 to your Maven POM.
@@ -63,6 +63,13 @@ The library is released under the Apache License and therefore is free to use in
 
 ## Changelog
 
+### Version 1.5.1 (Release May 2019)
+* Introduced a new `FormulaHelper` class for small utility methods on formulas
+* Added a new NNF predicate
+* Fixed an unspecified behaviour in `SATPredicate`
+* Fixed a small performance issue in the new backbone solver
+* Fixed a bug in a special case of the CNF transformation of a pseudo-Boolean constraint
+
 ### Version 1.5.0 (Release March 2019)
 * Algorithm & data structures for efficiently computing backbones of formulas
 * Data structures for UBTrees in order to efficiently identify sub- and supersets

src/main/java/org/logicng/backbones/BackboneGeneration.java

@@ -34,8 +34,6 @@
 
 import java.util.Collection;
 import java.util.Collections;
-import java.util.SortedSet;
-import java.util.TreeSet;
 
 /**
  * Main entry point for backbone computations.
@@ -44,7 +42,7 @@
  * For more control over the backbone solver you can create an instance of
  * {@link MiniSatBackbone} directly.  E.g., with an instance of {@link MiniSatBackbone}
  * the already loaded formulas can be re-used for multiple backbone computations.
- * @version 1.5.0
+ * @version 1.5.1
  * @since 1.5.0
  */
 public class BackboneGeneration {

src/main/java/org/logicng/backbones/MiniSatBackbone.java

@@ -55,7 +55,7 @@
  * <p>
  * Reference: Algorithm 3 in M. Janota, I. Lynce, J. Marques-Silva, Algorithms for Computing Backbones of Propositional
  * Formulae, AI Communications, Volume 28(2), 161-177, 2015.
- * @version 1.5.0
+ * @version 1.5.1
  * @since 1.5.0
  */
 public class MiniSatBackbone extends MiniSat2Solver {

src/main/java/org/logicng/collections/ImmutableFormulaList.java

@@ -48,11 +48,10 @@
 import java.util.SortedMap;
 import java.util.SortedSet;
 import java.util.TreeMap;
-import java.util.TreeSet;
 
 /**
  * A list of formulas.  This can represent the operands of an n-ary operator, a CNF, a DNF, a constraint, etc.
- * @version 1.0
+ * @version 1.5.1
  * @since 1.0
  */
 public final class ImmutableFormulaList implements Iterable<Formula> {

src/main/java/org/logicng/formulas/BinaryOperator.java

@@ -35,11 +35,10 @@
 import java.util.Iterator;
 import java.util.NoSuchElementException;
 import java.util.SortedSet;
-import java.util.TreeSet;
 
 /**
  * Super class for Boolean binary operators.
- * @version 1.2
+ * @version 1.5.1
  * @since 1.0
  */
 public abstract class BinaryOperator extends Formula {

src/main/java/org/logicng/formulas/NAryOperator.java

@@ -40,13 +40,12 @@
 import java.util.List;
 import java.util.NoSuchElementException;
 import java.util.SortedSet;
-import java.util.TreeSet;
 
 import static org.logicng.formulas.cache.TransformationCacheEntry.NNF;
 
 /**
  * Super class for Boolean n-ary operators.
- * @version 1.1
+ * @version 1.5.1
  * @since 1.0
  */
 public abstract class NAryOperator extends Formula {

src/main/java/org/logicng/formulas/PBConstraint.java

@@ -47,14 +47,13 @@
 import java.util.SortedMap;
 import java.util.SortedSet;
 import java.util.TreeMap;
-import java.util.TreeSet;
 
 import static org.logicng.formulas.cache.TransformationCacheEntry.NNF;
 
 /**
  * A pseudo-Boolean constraint of the form {@code c_1 * l_1 + ... + c_n * l_n R k} where {@code R} is one of
  * {@code =, >, >=, <, <=}.
- * @version 1.3
+ * @version 1.5.1
  * @since 1.0
  */
 public final class PBConstraint extends Formula {

src/main/java/org/logicng/formulas/cache/PredicateCacheEntry.java

@@ -30,7 +30,7 @@
 
 /**
  * The pre-defined predicate cache entries.
- * @version 1.3
+ * @version 1.5.1
  * @since 1.0
  */
 public enum PredicateCacheEntry implements CacheEntry {

src/main/java/org/logicng/predicates/NNFPredicate.java

@@ -32,14 +32,12 @@
 import org.logicng.formulas.Formula;
 import org.logicng.formulas.FormulaPredicate;
 
-import static org.logicng.formulas.cache.PredicateCacheEntry.IS_AIG;
-import static org.logicng.formulas.cache.PredicateCacheEntry.IS_CNF;
 import static org.logicng.formulas.cache.PredicateCacheEntry.IS_NNF;
 
 /**
  * NNF predicate.  Indicates whether a formula is in NNF or not.
- * @version 1.6.0
- * @since 1.6.0
+ * @version 1.5.1
+ * @since 1.5.1
  */
 public final class NNFPredicate implements FormulaPredicate {
     @Override

src/main/java/org/logicng/pseudobooleans/PBEncoder.java

@@ -48,7 +48,7 @@
 
 /**
  * An encoder for pseudo-Boolean constraints.
- * @version 1.1
+ * @version 1.5.1
  * @since 1.0
  */
 public class PBEncoder {

src/main/java/org/logicng/util/FormulaHelper.java

@@ -10,6 +10,8 @@
 
 /**
  * A class which contains utility methods for {@link Formula} objects.
+ * @version 1.5.1
+ * @since 1.5.1
  */
 public class FormulaHelper {
 

src/test/java/org/logicng/formulas/CacheTest.java

@@ -39,7 +39,7 @@
 
 /**
  * Unit tests for the package formulas.cache.
- * @version 1.3
+ * @version 1.5.1
  * @since 1.1
  */
 public class CacheTest {

src/test/java/org/logicng/predicates/NNFPredicateTest.java

@@ -34,8 +34,8 @@
 
 /**
  * Unit tests for the nnf predicate.
- * @version 1.6.0
- * @since 1.6.0
+ * @version 1.5.1
+ * @since 1.5.1
  */
 public class NNFPredicateTest {
 

src/test/java/org/logicng/util/FormulaHelperTest.java

@@ -39,6 +39,8 @@
 
 /**
  * Unit tests for {@link FormulaHelper}.
+ * @version 1.5.1
+ * @since 1.5.1
  */
 public class FormulaHelperTest {