[OMPI users] Open-MPI 1.3 and environment variables

[jody]

Under 1.2.8 i could check
  OMPI_MCA_ns_nds_vpid
to find out the process rank.
Under 1.3 that variable does not seem to exist anymore.
Is there an equivalent to hat variable in 1.3?
Have any other environment variables changed?

Thank You
  Jody