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[bugfix] Fixed MulticommDataHandle neighbor index

Linus Seelinger requested to merge fix-multicommdatahandle-rank-search into master
  • std::distance mixup could have lead to segfault for >1 neighbors

Weird enough that it worked so far; for the 2 subdomains case it's the same, but for higher ones std::distance gave a negative index rather than an absolute value now.

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