Interlace class for WideImage: Set the interlace flag of a WideImage object

This class can set the interlace flag of a WideImage object.
It takes a WideImage object and creates a copy of the object.

The class can set or reset the image interlace flag of the image object copy.

Usage example:

<?php 
include "WideImage.php";

$img_source = "http://files.phpclasses.org/graphics/phpclasses/logo-phpclasses.png";
$img = WideImage::load($img_source);

$img->resize(90, 30, 'inside' )
    ->interlace()
    ->output('png');