add missing license headers

h2/src/main/org/h2/value/ValueEnum.java

+/*
+ * Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
+ * and the EPL 1.0 (http://h2database.com/html/license.html).
+ * Initial Developer: H2 Group
+ */
 package org.h2.value;
 
 import java.util.Locale;
-
 import org.h2.api.ErrorCode;
 import org.h2.message.DbException;
 import org.h2.util.MathUtils;
-import org.h2.value.DataType;
 
 public class ValueEnum extends ValueEnumBase {
     private static enum Validation {

h2/src/main/org/h2/value/ValueEnumBase.java

+/*
+ * Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
+ * and the EPL 1.0 (http://h2database.com/html/license.html).
+ * Initial Developer: H2 Group
+ */
 package org.h2.value;
 
 import java.sql.PreparedStatement;
 import java.sql.SQLException;
-import java.util.Locale;
-
-import org.h2.message.DbException;
 import org.h2.util.MathUtils;
 
 /**