[master] DoFTools::make_periodicity_constraints not compatible with hp::DoFHandler

[j507]

The issue is explained in the dealii's Google Group conversation with the pull-request being a possible solution.

[j507]

The above mentioned pull-request solves the problem in serial but not in parallel.

[j507]

The problem lies in an active_fe_index() call outside the local domain. Possible solution is to store the FE indices in an entity that is known to all processors.