Constructor. Computes diff between sequences of strings.
$from_lines array An array of strings.: (Typically these are lines from a file.)
$to_lines array An array of strings.:
function Diff($from_lines, $to_lines) {
$eng = new _DiffEngine();
$this->edits = $eng
->diff($from_lines, $to_lines);
//$this->_check($from_lines, $to_lines);
}