Eclipse broken with 0.16

[Jeroen Frijters]

Hi Chris,

I just tried running Eclipse 3.0 and 3.1m5 and both crash when exiting,
due to a problem with persisting its settings:

java.lang.NullPointerException
        at gnu.xml.dom.DomNamedNodeMap.setNamedItem
(DomNamedNodeMap.java:209)
        at gnu.xml.dom.DomNamedNodeMap.setNamedItemNS
(DomNamedNodeMap.java:163)
        at gnu.xml.dom.DomElement.clone (DomElement.java:127)
        at gnu.xml.dom.DomNode.cloneNode (DomNode.java:1117)
        at gnu.xml.dom.DomNode.cloneNode (DomNode.java:1125)
        at gnu.xml.dom.DomNode.cloneNode (DomNode.java:1125)
        at gnu.xml.transform.TransformerImpl.transform
(TransformerImpl.java:191)
        at org.eclipse.ui.XMLMemento.save (XMLMemento.java)
        at org.eclipse.ui.internal.Workbench.saveMementoToFile
(Workbench.java)
        [...]

Can you please take a look at this?

Thanks,
Jeroen