conversion to CNF (#434)

* Add files via upload

* Create foo

* All the files needed for the CNF conversion

* Delete foo

* Create foo

* Test cases for the CNF conversion

* Delete foo

* Add files via upload

* Add files via upload

* change some public methods to private

* Delete CNFConverter.java

* Delete CloneHelper.java

* Delete MultiAndExpression.java

* Delete MultiOrExpression.java

* Delete MultipleExpression.java

* Create foo

* Add files via upload

* Delete CNFTest.java

* Delete StepLastHelper.java

* Create foo

* Add files via upload

* Delete foo

* Delete foo

* Add files via upload

* Add files via upload

* Delete CNFConverter.java

* Delete CloneHelper.java

* Delete MultiAndExpression.java

* Delete MultiOrExpression.java

* Delete MultipleExpression.java

* Create foo

* Add files via upload

* Delete foo

* Delete CNFTest.java

* Create foo

* Add files via upload

* Delete foo

* Add files via upload

* Add files via upload

Author: messfish

src/main/java/net/sf/jsqlparser/expression/BinaryExpression.java

@@ -30,7 +30,9 @@ public abstract class BinaryExpression implements Expression {
     private Expression leftExpression;
     private Expression rightExpression;
     private boolean not = false;
-
+    
+    
+    
     public BinaryExpression() {
     }
 
@@ -53,7 +55,11 @@ public void setRightExpression(Expression expression) {
     public void setNot() {
         not = true;
     }
-
+    
+    public void removeNot() {
+        not = false;
+    }
+ 
     public boolean isNot() {
         return not;
     }
@@ -64,4 +70,5 @@ public String toString() {
     }
 
     public abstract String getStringExpression();
+    
 }