Error codes and classes

The MPIException subclasses

  MPIErrBuffer
  MPIErrCount
  MPIErrType
  MPIErrTag
  MPIErrComm
  MPIErrRank
  MPIErrRequest
  MPIErrRoot
  MPIErrGroup
  MPIErrOp
  MPIErrTopology
  MPIErrDims
  MPIErrArg
  MPIErrUnknown
  MPIErrTruncate
  MPIErrOther
  MPIErrIntern

correspond to the standard MPI error classes. [Not implemented in the current release.]