Removed additional elem->giveMaterial() and gp->giveMaterial(). In some places the material number was exported, these have been changed to export of the cross section number instead.
Moved a conditional code block from updateYourself in ConcreteDPMStatus to giveRealStressVector and introduced a temp variable. This in order to remove the need for the status to ask the material for data.

However, ConcreteDPMStatus :: restoreConsistency() still asks for the material.
Minor updates for the structural interface elements... still in development