BUG: Fix invalid assignment of second VoronoiBoundaryOrigin.

Change-Id: Ided50dc59198e33a30ccc8791c0ecea24774a3b0
BUG: Fix memory leak in MetaImageIO after exception

See ITK-3186

Change-Id: Ia78caea1c140c93f209b8b8505d4b75a06ed39fb