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* This function will then be used by lazy netcdf implementation to map
  a page of inaccessible memory.

* This is configurable.

* Use distributed directory for intersection computation by default.

* The function is correspondingly renamed to reflect the narrower
  functionality.

* Now that setting up of communications has been consolidated in
  cdiPioCommInit, the initial callback of cdiPioInit can now be
  called regardless of backend mode.

* Every server now serves a subset of the clients only.

* This moves the check and conversion to lower case to the public
  interface and simplifies internals.