[Kst] [PATCH] fix plotgroup deletion

[George Staikos]

This seems to fix plotgroup deletion.  It looks like recursive removal of 
children was really broken, which I fixed, and it removes all references to 
get rid of the stale objects in memory.

Look ok?

-- 
George Staikos
KDE Developer				http://www.kde.org/
Staikos Computing Services Inc.		http://www.staikos.net/
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