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Fix curved element normals

Dave Moxey requested to merge fix/curved-tets into master

This MR fixes some issues with curved element normals, mostly relating to the DG routine ExpList2D::v_GetNormals. Additionally, the routines in the 3D element expansions for curvilinear normal generation use an incorrect formulation, where the face Jacobian is not extracted properly for the purposes of projection onto the polynomial space. Both of these issues are corrected in this MR.

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