introduced linking between Function and ASTNode

Author: wumpz

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

@@ -22,11 +22,12 @@
 package net.sf.jsqlparser.expression;
 
 import net.sf.jsqlparser.expression.operators.relational.ExpressionList;
+import net.sf.jsqlparser.parser.ASTNodeAccessImpl;
 
 /**
  * A function as MAX,COUNT...
  */
-public class Function implements Expression {
+public class Function extends ASTNodeAccessImpl implements Expression {
 
     private String name;
     private ExpressionList parameters;

src/main/java/net/sf/jsqlparser/parser/ASTNodeAccessImpl.java

@@ -19,24 +19,6 @@
  * <http://www.gnu.org/licenses/lgpl-2.1.html>.
  * #L%
  */
- /*
- * Copyright (C) 2015 JSQLParser.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
- * MA 02110-1301  USA
- */
 package net.sf.jsqlparser.parser;
 
 /**