SfxItemPool: replace deque with vector for SfxPoolItem array

Yields measurable speedup on load/store of large documents, wonder where
the equivalent patch i committed long time ago to OOo went...

svl/source/inc/poolio.hxx

@@ -56,7 +56,7 @@ struct SfxPoolVersion_Impl
                     {}
 };
 
-typedef std::deque<SfxPoolItem*> SfxPoolItemArrayBase_Impl;
+typedef std::vector<SfxPoolItem*> SfxPoolItemArrayBase_Impl;
 
 typedef boost::shared_ptr< SfxPoolVersion_Impl > SfxPoolVersion_ImplPtr;
 typedef std::deque< SfxPoolVersion_ImplPtr > SfxPoolVersionArr_Impl;