Added *BSD (and Darwin) ioctl cdaudio playing. Couple bugfixes. 'end-track','current-track' and 'cddb-discid' propert...

Original commit message from CVS:
Added *BSD (and Darwin) ioctl cdaudio playing. Couple bugfixes. 'end-track','current-track' and 'cddb-discid' properties and 'track-change' signal for the element.