*More cleanification in gtk interface: now to change the

*More cleanification in gtk interface: now to change the
title/chapter/audio/spu/angle, we tell the input to do intead of doing
it inside the interface. It results in fewer locks during the changes.

*The dvd plugin reads again blocks of 32 sectors to gain speed since
there are no more lock-ups during stream change. I've also created a new
file that contain function to described video and audio streams with ifo
datas.

The changes are made only for gtk. We should update the other interfaces
soon (beos at least).

There is a memory corruption somewhere that make the vlc crash. I've no
idea where to search.