First commit of ccio branch to add changes for the topology-aware MPIO VFD. The topology-aware VFD is part of the custom-collective I/O (CCIO) verison of the MPIO VFD. All CCIO modifications rely on a flattened-buffer (flatbuf) representation of the data in file and memory space. The CCIO options are enabled by Env Vars, and work by rerouting the usual collective-IO calls into new select_read and select_write VFD callback functions. The flatbuf selections are performed using exisiting HDF5 functionalities for dataspace selections.

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