Move abort function to Communicate class
Since MPI_Abort is a communication-related function, it should be a part of Communicate rather than Ippl or a global function.
Code indexing in gitaly is broken and leads to code not being visible to the user. We work on the issue with highest priority.
Since MPI_Abort is a communication-related function, it should be a part of Communicate rather than Ippl or a global function.