[Dolphin][Suggest]Remove Preview Panel and add Tooltip Preview.

[Giuseppe Pennisi]

Remove Preview Panel and add Tooltip Preview.

Because:
1. Look is better;
2. "Normal" user not use the advanced features of Preview Panel (i.e.:
tags, etc..).
3. Preview Panel wastes useful space (expecially on small screens).
4. The preview can be replaced by Tooltip preview.

Please view the image to show an example.
http://imageshack.us/photo/my-images/341/previewxq.png/