destroyed way too early when there are out-side referenced nodes 
hanging around and that need them. However, since we're
refcounting, the documents have to disconnect the children in that 
case to avoid cycles.. Should fix some crashes with some AJAXy stuff

(Merged from Apple's tree)
BUG:128015
CCBUG:133680

svn path=/branches/KDE/3.5/kdelibs/; revision=595496