Check correctness of all elements

[mscroggs]

• [ ] alfeld-sorokina.def
• [ ] argyris.def
• [ ] arnold-boffi-falk.def
• [ ] arnold-winther.def
• [ ] bell.def
• [ ] bernardi-raugel.def
• [ ] bernstein.def
• [ ] bogner-fox-schmitt.def
• [ ] brezzi-douglas-duran-fortin.def
• [ ] brezzi-douglas-fortin-marini.def
• [ ] brezzi-douglas-marini.def
• [ ] bubble-enriched-lagrange.def
• [ ] bubble.def
• [ ] buffa-christiansen.def
• [ ] conforming-crouzeix-raviart.def
• [ ] crouzeix-falk.def
• [ ] crouzeix-raviart.def
• [ ] direct-serendipity.def
• [ ] dpc.def
• [ ] dual.def
• [ ] enriched-galerkin.def
• [ ] fortin-soulie.def
• [ ] gauss-legendre.def
• [ ] guzman-neilan.def
• [ ] hellan-hermann-johnson.def
• [ ] hermite.def
• [ ] hsieh-clough-tocher.def
• [ ] huang-zhang.def
• [ ] kong-mulder-veldhuizen.def
• [ ] lagrange.def
• [ ] lfeg.def
• [ ] mardal-tai-winther.def
• [ ] mini.def
• [ ] morley-wang-xu.def
• [ ] morley.def
• [ ] nedelec1.def
• [x] nedelec2.def
• [ ] nonconforming-arnold-winther.def
• [ ] p1-iso-p2.def
• [ ] p1-macro.def
• [ ] pechstein-schoberl.def
• [ ] radau.def
• [ ] rannacher-turek.def
• [ ] raviart-thomas.def
• [ ] reduced-hsieh-clough-tocher.def
• [ ] regge.def
• [ ] rotated-buffa-christiansen.def
• [ ] scott-vogelius.def
• [ ] scurl.def
• [ ] sdiv.def
• [ ] serendipity.def
• [ ] taylor-hood.def
• [ ] taylor.def
• [ ] tnt-curl.def
• [ ] tnt-div.def
• [ ] tnt.def
• [ ] transition.def
• [ ] trimmed-serendipity-curl.def
• [ ] trimmed-serendipity-div.def
• [ ] vector-bubble-enriched-lagrange.def
• [ ] vector-dpc.def
• [ ] vector-lagrange.def
• [ ] vector-q.def
• [ ] wu-xu.def

[jpdean]

I'll start easy with Lagrange :)