Changeset 9871:9d72fd83da40
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simobject: Fix handling of parents for simobject vectors

SimObjectVector objects did not provide the same interface to
the _parent attribute through get_parent() like a normal
SimObject.  It also handled assigning a _parent incorrectly
if objects in a SimObjectVector were changed post-creation,
leading to errors later when the simulator tried to execute.
This patch fixes these two omissions.