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Sparsity patterns without constrained dofs
This patch adds a new keyword argument `keep_constrained::Bool=true` to `create_sparsity_pattern` which, when set to `false`, do not create entries in the global matrix for rows/values that correspond to constrained degrees of freedom. Naturally this can only be used with local condensation of constraints (cf. #528). Another necessary change included in this patch is that assembly now ignores entries in the local matrix that are zero (in particular rows/columns in the local matrix which have been zeroed out in the local condensation).
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