Bug 145724 Change version after auto convert
By the request of 136536, user get warning message to confirm the auto convert. If user select yes, the file convert to newest format, but the version is still old. If user open this file again, he'll get the warning message even the file converted.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/util/ModelUtil.java
* </ul>
	 * 
	 * @param propDefn
	 *            definition of property
	 * @param value
	 *            value to clone
	 * @return new value
	 */
	public static Object copyValue( IPropertyDefn propDefn, Object value )
	{
		if ( value == null || propDefn == null )
			return null;
		switch ( propDefn.getTypeCode( ) )
		{
			case PropertyType.STRUCT_TYPE :
				if ( propDefn.isList( ) )
					return ModelUtil.cloneStructList( (List) value );
				return ( (Structure) value ).copy( );
			case PropertyType.ELEMENT_REF_TYPE :
			case PropertyType.STRUCT_REF_TYPE :
				ReferenceValue refValue = (ReferenceValue) value;
				return refValue.copy( );
			case PropertyType.LIST_TYPE :
				return ModelUtil.clonePropertyList( (List) value );
		}
		return value;
	}
	/**
	 * Copies a list of simple property values.
	 *