Finite Element Method (FEM)

@robbievanleeuwen this is potentially related to #159. But I've noticed with what appears to be a reduced default size of the plots from matplotlib that some portion of the legends on certain plots are disappearing off the edge of the default plot size. e.g.:-

Wondering if a defaul

Lagrange multipliers can be used to enforce constraints on the displacements of the system to machine precision. The introduction of these constraints change the structure and increase of the sparse matrix and restrict the type of solver to be used to only direct linear solvers.

It should be possible to implement this partitioned structure for displacement boundary conditions for non-linear pr