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Fix/cc ghost assembly

Timo Koch requested to merge fix/cc-ghost-assembly into master

Fixes #817 (closed)

The matrix row entries for ghost element were erroneously overwritten with fluxes due to the “inverse” assembly. This fix makes sure ghosts always have zero update.

Big thanks to @leopold.stadler who pointed me to this bug!

Should be backported to 3.1, possibly 3.0.

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