Uncommented beforesave handler in TestWorkbook

Added empty function un vtkProjectCreationUtilities
Added function to add the save handler.

Tests don't work as the code for vtkExportConfiguration is not yet in the
add-in, and accessing code from another workbook which is not an
add-in is difficult.

That is to say that calling VBAToolKit_DEV.vtkExportConfiguration raises
an error 424 if we are not in VBAToolKit_DEV.

TODO : add the functionality in vtkCreateProject, when
vtkExportConfiguration will be in the add-in.