Don't overwrite plasma files.
Since Amarok is using plasma trunk, this causes big problems for users with KDE 4.1 plasma installed.

For anybody that has suffered at the hands of this indiscretion, you'll have to manually uninstall amarok, then replace your original plasma installation from your package manager.

A big sideeffect of this fix is that Amarok-plasma probably won't work for anyone with no plasma installation.
We need to resolve this.