Merge branch 'fix-send-for-variable-size-communicator-master' into 'master'

Jö Fahlkerequested to merge
cherry-pick-407bb7c9 into releases/2.6

Do not assume that the complete message fits into tht buffer when sending in VariableSizeCommunicator

Closes #105 (closed)

See merge request !416 (merged)

(cherry picked from commit 407bb7c9)

b644237b Do not assume that a message cannot be split into multiple messages when sending. 91bb93d2 Use decrement operator

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