Top Cart Tooltip, Footer Newsletter and general improvements.

Header improvements:
- Removed topLinks.
- Removed welcome-message.
- Added custom "quick-access" links and "Top Cart Tooltip" ("persistent_cart" -local.xml-).

CloudZoom z-index fix.
Buttons in buttons-set floated right to improve forms usability.
Moved left newsletter to the footer. Improved template/newsletter/subscribe.phtml.
ChangeLog.