Use quadratics in higher order FE tests
Use quadratics in higher order FE tests

This ought to exercise the shape functions better, and it will let us
get more interesting second derivatives than just "zero".

jwpeterson/libmesh,capitalaslash/libmesh,dschwen/libmesh,jwpeterson/libmesh,capitalaslash/libmesh,dschwen/libmesh,roystgnr/libmesh,libMesh/libmesh,dschwen/libmesh,dschwen/libmesh,BalticPinguin/libmesh,libMesh/libmesh,jwpeterson/libmesh,jwpeterson/libmesh,libMesh/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,BalticPinguin/libmesh,BalticPinguin/libmesh,capitalaslash/libmesh,roystgnr/libmesh,BalticPinguin/libmesh,dschwen/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh,dschwen/libmesh,libMesh/libmesh,roystgnr/libmesh,capitalaslash/libmesh,jwpeterson/libmesh,jwpeterson/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh,capitalaslash/libmesh,libMesh/libmesh,roystgnr/libmesh,jwpeterson/libmesh,roystgnr/libmesh,capitalaslash/libmesh,jwpeterson/libmesh,dschwen/libmesh,dschwen/libmesh,libMesh/libmesh,libMesh/libmesh,libMesh/libmesh,roystgnr/libmesh