Description:
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Running  imagick 3.1.0RC2

Issue:
Cloning Imagick object returns 0 for getImageLength() and getImageSize()

This is broken with clone() method and clone keyword. Previous versions would return correct filesize.

Test script:
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<?php
$im = new Imagick('http://static.php.net/www.php.net/images/php.gif');

// Both should return filesize in bytes.
echo "Original\n";
echo 'getImageLength: '.$im->getImageLength()."\n";
echo 'getImageSize: '.$im->getImageSize()."\n";

// All cases below now return 0;
$cloned_im = clone $im;
echo "clone Keyword\n";
echo 'getImageLength: '.$cloned_im->getImageLength()."\n";
echo 'getImageSize: '.$cloned_im->getImageSize()."\n";


$cloned_im_by_method = $im->clone();
echo "clone Method\n";
echo 'getImageLength: '.$cloned_im_by_method->getImageLength()."\n";
echo 'getImageSize: '.$cloned_im_by_method->getImageSize()."\n";

?>

Expected result:
----------------
Cloned object methods should return correct filesize.

Actual result:
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Methods return 0 instead of correct filesize.