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Optionally transmit sender rank in datahandle

Steffen Müthing requested to merge feature/transmit-sender-rank-in-datahandle into master

During Linus's work on the GENEO preconditioner, we noticed that you sometimes need to know the sender rank in the data handle. This information is currently not exposed, but as we already optionally wrap the grid-provided buffer, I extended the buffer wrapper to allow querying the sender rank. This information is not transmitted by default, you can enable it by constructing a custom DataHandle and setting the second template parameter of the CommunicationDescriptor to true.

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