Merge branch 'feature/assembleResidualInitiallyZero' into 'master'

Timo Kochrequested to merge
cherry-pick-05aefbc6 into releases/3.4

[fvassembler] Set r=0 in the beginning of assembleResidual

See merge request !2705 (merged)

(cherry picked from commit 05aefbc6)

36d46465 [fvassembler] Set r=0 in the beginning of assembleResidual.

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