Additive read distributed #1650
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This PR adds an option to communicate overlap in the distributed matrix'
read_distributed. If the option is used, nonzero entries present in multiple ranks are added up on the owning rank rather than thrown away inread_distributed.This can be useful e.g. if in a domain decomposed finite element setting, each rank assembles their local contribution to a global system matrix and when assembling the global system matrix information on the subdomain boundaries has to be exchanged.
TODO: