patch: allow url_alias paths to have arguments

Currently, urls that use the url_alias table do not allow arguments. This is not desirable because it is useful to be able to specify arguments on a script that is aliased without having to refer to it by node number.

The code below replaces the drupal_get_normal_path() function in common.inc to allow aliased paths to have arguments.

/**                                                                                                                                                                                                                   
 * Given a path alias, return the internal path it represents.                                                                                                                                                        
 */
function drupal_get_normal_path($path) {
  if (($map = drupal_get_path_map()) && isset($map[$path])) {
    return $map[$path];
  }
  elseif (function_exists('conf_url_rewrite')) {
    return conf_url_rewrite($path, 'incoming');
  }
  else {
    //look at each of the path components of $path and allow extra components to be arguments                                                                                                                         
    //do a greedy search first for the largest paths                                                                                                                                                                  
    if ($map && (strpos($path, '/') !== false)) {
      $newpath = clone($path);
      $args = '';
      while($path_end = strrpos($newpath, '/')) {
        $args = substr($newpath, $path_end).$args;
        $newpath = substr($newpath, 0, $path_end);
        //check to see if this new path exists in the path map                                                                                                                                                        
        if(isset($map[$newpath])) {
          return $map[$newpath].$args;
        }
      }
    }

    //no alias was found, return the original path                                                                                                                                                                    
    return $path;
  }
}