Look up POR and the tensor components with find(), and POR only for S.
Reading E on a model without node pressure no longer made S and the
derived results available. Use per-element node offsets instead of
assuming eight nodes per element, clear the element nodes when the parts
are read again, require the complete stress tensor for derived results,
and document the Biot coefficient of 1.
Kristian Bendiksen
917e8552df