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Changes between Version 2 and Version 3 of PDAF3_init_parallel

v2	v3
5	5	The routine `PDAF3_set_parallel` is called in `init_parallel_pdaf` to initialize the parallelization configuration inside PDAF and return the information to the user code.
6	6
7		Note: In PDAF V3.0, the actual initialization of the parallelization was done directly in `init_parallel_pdaf` and then provided to PDAF by calling [wiki:PDAF3_set_parallel]. In PDAF V3.1 and later one does no longer need this functionality in the user code.
	7	Note: In PDAF V3.0, the actual configuration of the parallelization was done directly in `init_parallel_pdaf` and then provided to PDAF by calling [wiki:PDAF3_set_parallel]. In PDAF V3.1 and later this is no longer needed.
8	8
9	9	For calling the routine one sets the ensemble size (`dim_ens`) and number of parallel model tasks (`n_modeltasks`). In addition, one provides the MPI communicator that was initialized by the model (`COMM_model`) or the main program in case of offline coupled DA. The routine updates the model communicator for the ensemble setup. Further, it provides the rank and size information for the model commuicator. Further the communicator of processes that execute the analysis step (`COMM_assim`) and the related process rank and size information is provided. The latter can be used in call-back routines that are executed during the analysis step.