More complete support for periodic boundary conditions

This patch adds better support for specifying periodic boundary conditions. In particular, collect_periodic_faces(!) is added, which, for given input mirror and image sets computes the matching face. The result can be passed directly to the PeriodicDirichlet constructor. The existing limitation about full periodicity (i.e. all directions) is removed.
Ferrite-FEM · Sep 12, 2022 · 71986fe · 71986fe
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diff --git a/docs/src/reference/boundary_conditions.md b/docs/src/reference/boundary_conditions.md
@@ -8,6 +8,8 @@ DocTestSetup = :(using Ferrite)
 ConstraintHandler
 Dirichlet
 PeriodicDirichlet
+collect_periodic_faces
+collect_periodic_faces!
 add!
 close!
 apply!