Cleanup/periodic bc
What this MR does / why does DuMux need it:
Renames the perodic map and uses this map in the assembler.
Notes for the reviewer
TODO: insert text here
Before you request a review from someone, make sure to revise the following points:
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does your change affect public interfaces or behavior, or, does it introduce a new feature? If so, document the change in CHANGELOG.md
.
Edited by Martin Schneider