[WIP] Implement new type for more flexible mapping of degrees of freedom #25
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It's better to implement three different kind of DOFMaps. This is the first one and should be compatible with the curren definition. We can then later on extend to FixedDOFMap where we can effectively make a bandwidth-minimizing permutation ourself and later on VariableDOFMap so that each node can have different number of dofs.
Also, losen data type definitions in `add!` so that generators works also when adding data do sparse matricse.
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Currently, the location of degrees of freedom in matrix level is implemented somewhat naive way, given maximum number of degrees of freedom
max_dim, node idj, and index of dofi, we havegdofs(j,i) = max_dim(j-1)+i. This works, but does not support variable number of degrees of freedom per node, which is mandatory if we want to couple structural elements with continuum elements or have, for instance, pressure degree of freedom in some nodes and in some nodes not. This PR implements new typeDOFMapwhich makes it easy to create more complex configurations of degrees of freedom.