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Introduce PeriodicBasis

Oliver Sander requested to merge introduce-periodic-basis into master

PeriodicBasis is a meta basis---a basis that is parametrized with another basis. In a PeriodicBasis, global degrees of freedom of the host basis can be grouped into equivalence classes, which are then treated as single global degrees of freedom by the PeriodicBasis. This allows, in particular, to implement periodic boundary conditions for discretizations without intersection integrals.

Edited by Oliver Sander

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