Use correct second fundamental tensor in nonplanarcosseratshellenergy and surfacecosseratenergy
@osander: can you have a look?
The problem now though is: What order to use for the curved element? For now: order of the finite element space of the displacement
(MR for the quadrature error in curvedgrid: iwr/dune-curvedgrid!16 (merged))
Edited by Nebel, Lisa Julia