Updated Dirichlet constraints to handle nodes
Fixed simple compilation error
Added edge BC support to BoundaryInfo, and impose Dirichlet boundary constraints on edges.
Updated systems_of_equations_ex6 to impose a node and edge Dirichlet boundary condition.
Parallel communication of edge BCIDs
Index typo fix
Adding Elem::type_to_n_edges_map
Merge pull request #1 from roystgnr/parallel_edgebcs

Parallel communication of edge BCIDs
Added warnings in XDR and ExodusII I/O that edge boundary condition info is not supported by the format.
Added warning to Nemesis_IO about edge boundary IDs not being written out. Also, updated comments in boundary_info.h to emphasize that edge-based boundary IDs should only be used in 3D.
Added extra warnings for Exodus and Nemesis about edge BCs not being written out. These warnings are relevant when we do write_equation_systems. The other ones were called when we just wrote the mesh.
Merge pull request #172 from dknez/node_and_edge_dirichlet

Enable DirichletBoundary on nodes and edges