QuadraturePoints  -- any integer type for offsets

In PV SM XML, remove vtk id type qualifier, and add a category
in the menu.

Change-Id: I38fd56f40cbf55ae06a28629df7bc2cdca7a96b1
Merge topic 'quadrature-points-xml' into next

8918e4f QuadraturePoints  -- any integer type for offsets