Account for the merging programs:

Previous development, not current, not supported:
mpi_cluster_merge.py
mpi_cluster_two_merge_cs.py
mpi_cluster_two_merge.py
mpi_merge.py
single_node_merge.py
worker2.py

dev_cxi_merge.py:  Main single-node application under development, using Python MP.
dev_mpi_cluster_two_merge.py:  Same as cxi.merge but redesigned for MPI.

dev_cxi_merge_refltable.py:  Same as cxi.merge, but using DIALS reflection tables instead of Python dictionary.
dev_cxi_mpi_merge_refltable.py:  Same as cxi_merge_refltable but redesigned for MPI.
