Log Message:
Update to 2.6.8:

* Fixed bugs:
	Bug 333398 - Menubars in panel applets have sunken mode (Clearlooks)
	Bug 317639 - GtkHScale not rendered properly in Clearlooks
	Bug 148848 - No visual difference of disabled checkboxes in SimplySmooth (Smooth)

* Lots of other miscellaneous fixes
* Prevent unnecessary symbols from being exported (all engines)
* Prefix symbols in engines, to prevent possible conflicts with applications
* Improved RTL support in Clearlooks