/*
* Is the shuffle flag set?
*
* This method raises an Xmms::Error exception if XMMS is not running.
*
* Examples:
* puts 'shuffling' if remote.is_shuffling?
* puts 'shuffling' if remote.shuffling?
* puts 'shuffling' if remote.is_shuffle?
* puts 'shuffling' if remote.shuffle?
*
*/
static VALUE xr_shuffle(VALUE self) {