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Make method MessageBufferIF::read non-const

Oliver Sander requested to merge unconstify-message-buffer-read into master

The method CommDataHandleIF::scatter receives a non-const reference to the message buffer. This reference is non-const because reading from the buffer advances the internal iterator, and hence changes the buffer state. However, the MessageBufferIF claims that the read method is const. This patch removes the const to make the interface consistent.

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