CSP3 solver output may now be turned into competition output.

Competition output is made of "c", "s", "o" and "v" lines (just like SAT
competition output). Competition output is enabled when the
"CompetitonOutput" JVM property is set.

org.sat4j.csp/src/main/java/org/sat4j/csp/CSPLauncher.java

@@ -40,7 +40,9 @@ public class CSPLauncher extends AbstractLauncher {
 	private boolean shouldOnlyDisplayEncoding = false;
 	
 	public CSPLauncher() {
-		bufferizeLog();
+		if(System.getProperty("CompetitionOutput") != null) {
+			bufferizeLog();
+		}
 	}
 
 	/*

org.sat4j.csp/src/main/java/org/sat4j/reader/ECSPFormat.java

@@ -100,7 +100,10 @@ public enum ECSPFormat {
 			if(shouldOnlyDisplayEncoding) {
 				return pw;
 			}
-			XMLCommentPrintWriter commentPrintWriter = new XMLCommentPrintWriter(pw);
+			if(System.getProperty("CompetitionOutput") != null) {
+				return pw;
+			}
+			final XMLCommentPrintWriter commentPrintWriter = new XMLCommentPrintWriter(pw);
 			commentPrintWriter.addDncPrefix("v ");
 			return commentPrintWriter;
 		}