Some skin resources are requested with absolute paths instead of relative ones

An example where this happens:

The undelete button image is not displayed for DeletedDocument.
The button's image is not found because the SSX adds an extra leading slash in the image's location

$xwiki.getSkinFile('/icons/silk/arrow_refresh.png')

Result:

There are about 4 places where this happens and the solution is to remove the leading slash from the requested resource's location.