Merge branch 'feature/mpfa-boundary-flag' into 'master'
Feature/mpfa boundary flag
See merge request !2695 (merged)
(cherry picked from commit 3c8fd3c8)
30717984 [mpfa][scvf] add boundary flag 80fa8202 [test][co2] add test with mpfa c7b8a00c [test][co2] use caches for speedup