BUG: Don't use InsertElement which modifies MTime

Use the VectorContainer's STL interface to avoid causing MTime to be
called too many time. This has reported to overflow the global time
stamp with it's a 32-bit integer.
SimpleITK/SimpleITK#750
closes ITK/ITK#1352

Modules/Filtering/ImageGrid/include/itkBSplineScatteredDataPointSetToImageFilter.hxx

@@ -348,8 +348,7 @@ BSplineScatteredDataPointSetToImageFilter<TInputPointSet, TOutputImage>
       this->m_OutputPointData->Begin();
     while( ItIn != this->m_InputPointData->End() )
       {
-      this->m_InputPointData->InsertElement(
-        ItIn.Index(), ItIn.Value() - ItOut.Value() );
+      this->m_InputPointData->CastToSTLContainer()[ItIn.Index()] = ItIn.Value() - ItOut.Value();
 
       if( this->GetDebug() )
         {
@@ -1101,6 +1100,7 @@ BSplineScatteredDataPointSetToImageFilter<TInputPointSet, TOutputImage>
   typename PointDataImageType::IndexType startPhiIndex =
     this->m_PhiLattice->GetLargestPossibleRegion().GetIndex();
 
+  this->m_OutputPointData->CastToSTLContainer().resize(this->m_InputPointData->Size());
   typename PointDataContainerType::ConstIterator ItIn =
     this->m_InputPointData->Begin();
   while( ItIn != this->m_InputPointData->End() )
@@ -1146,8 +1146,7 @@ BSplineScatteredDataPointSetToImageFilter<TInputPointSet, TOutputImage>
         break;
         }
       }
-    this->m_OutputPointData->InsertElement( ItIn.Index(),
-      collapsedPhiLattices[0]->GetPixel( startPhiIndex ) );
+    this->m_OutputPointData->CastToSTLContainer()[ItIn.Index()] = collapsedPhiLattices[0]->GetPixel(startPhiIndex);
     ++ItIn;
     }
 }