libMesh/libmesh — pull request #341 by roystgnr (2014-09-02 14:05:26+00:00)
Title: Sparse scalars

This is NOT ready to merge before app-level testing.

This is my first crack at enabling the restriction of SCALAR variables to particular subdomains. dof_indices() (and so indirectly sparsity pattern construction) will then reflect the reduced interactions.