Add solutionlistener feature.

org.sat4j.core/features.properties

@@ -6,4 +6,6 @@ simplifications=Learned constraints simplification policy
 deletion=Learned constraints deletion policy
 varheuristics=Variable selection heuristics
 phaseheuristics=Phase selection policy for a given variable
-reader=Reader responsible for feeding the solver
\ No newline at end of file
+reader=Reader responsible for feeding the solver
+solver=The complexity hierarchy of solvers in Sat4j
+solutionlistener=A listener called when a model is found by the solver
\ No newline at end of file

org.sat4j.core/src/main/java/org/sat4j/DecisionMode.java

@@ -31,6 +31,7 @@ package org.sat4j;
 
 import java.io.PrintWriter;
 
+import org.sat4j.annotations.Feature;
 import org.sat4j.reader.Reader;
 import org.sat4j.specs.AssignmentOrigin;
 import org.sat4j.specs.ILogAble;
@@ -46,6 +47,7 @@ import org.sat4j.tools.Backbone;
  * @author leberre
  * 
  */
+@Feature("solutionlistener")
 final class DecisionMode implements ILauncherMode {
     private ExitCode exitCode = ExitCode.UNKNOWN;
     private int nbSolutionFound;

org.sat4j.core/src/main/java/org/sat4j/OptimizationMode.java

@@ -31,6 +31,7 @@ package org.sat4j;
 
 import java.io.PrintWriter;
 
+import org.sat4j.annotations.Feature;
 import org.sat4j.core.Vec;
 import org.sat4j.core.VecInt;
 import org.sat4j.reader.Reader;
@@ -50,6 +51,7 @@ import org.sat4j.tools.LexicoDecorator;
  * @author leberre
  * 
  */
+@Feature("solutionlistener")
 final class OptimizationMode implements ILauncherMode {
     private int nbSolutions;
     private ExitCode exitCode = ExitCode.UNKNOWN;

org.sat4j.core/src/main/java/org/sat4j/tools/CheckMUSSolutionListener.java

@@ -35,6 +35,7 @@ import java.util.List;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
+import org.sat4j.annotations.Feature;
 import org.sat4j.core.ASolverFactory;
 import org.sat4j.core.VecInt;
 import org.sat4j.specs.ContradictionException;
@@ -42,6 +43,7 @@ import org.sat4j.specs.ISolver;
 import org.sat4j.specs.IVecInt;
 import org.sat4j.specs.TimeoutException;
 
+@Feature("solutionlistener")
 public class CheckMUSSolutionListener implements SolutionFoundListener {
 
     private List<IVecInt> clauses;

org.sat4j.core/src/main/java/org/sat4j/tools/SolutionFoundListener.java

@@ -29,6 +29,7 @@
  *******************************************************************************/
 package org.sat4j.tools;
 
+import org.sat4j.annotations.Feature;
 import org.sat4j.specs.IVecInt;
 
 /**
@@ -40,6 +41,7 @@ import org.sat4j.specs.IVecInt;
  * @since 2.3.3
  * 
  */
+@Feature("solutionlistener")
 public interface SolutionFoundListener {
 
     SolutionFoundListener VOID = new SolutionFoundListener() {