Update to OpenMPI 1.4.2

Changes in v1.4.2 as compared to v1.4.1:

- Fixed problem when running in heterogeneous environments.
- Update LSF support to ensure that the path is passed correctly.
- Fixed some miscellaneous oversubscription detection bugs.
- IBM re-licensed its LoadLeveler code to be BSD-compliant.
- Various fixes for multithreading deadlocks, race conditions, and
  other nefarious things.
- Fixed ROMIO's handling of "nearly" contiguous issues (e.g., with
  non-zero true_lb).
- Bunches of Windows build fixes.
- Now allow the graceful failover from MTLs to BTLs if no MTLs can
  initialize successfully.
- Added "clobber" information to various atomic operations, fixing
  erroneous behavior in some newer versions of the GNU compiler suite.
- Update various iWARP and InfiniBand device specifications in the
  OpenFabrics .ini support file.
- Fix the use of hostfiles when a username is supplied.
- Various fixes for rankfile support.
- Updated the internal version of VampirTrace to 5.4.12.
- Fixed OS X TCP wireup issues having to do with IPv4/IPv6 confusion
  (see https://svn.open-mpi.org/trac/ompi/changeset/22788 for more
  details).
- Fixed some problems in processor affinity support, including when
  there are "holes" in the processor namespace (e.g., offline
  processors).
- Ensure that Open MPI's "session directory" (usually located in /tmp)
  is cleaned up after process termination.
- Fixed some problems with the collective "hierarch" implementation
  that could occur in some obscure conditions.
- Various MPI_REQUEST_NULL, API parameter checking, and attribute
  error handling fixes.
- Fix case where MPI_GATHER erroneously used datatypes on non-root nodes.
- Patched ROMIO support for PVFS2 > v2.7 (patch taken from MPICH2
  version of ROMIO).
- Fixed "mpirun --report-bindings" behavior when used with
  mpi_paffinity_alone=1.  Also fixed mpi_paffinity_alone=1 behavior
  with non-MPI applications.
- Ensure that all OpenFabrics devices have compatible receive_queues
  specifications before allowing them to communicate.  See the lengthy
  comment in https://svn.open-mpi.org/trac/ompi/changeset/22592 for details.
- Fix some issues with checkpoint/restart.
- Improve the pre-MPI_INIT/post-MPI_FINALIZE error messages.
- Ensure that loopback addresses are never advertised to peer
  processes for RDMA/OpenFabrics support.
- Fixed a CSUM PML false positive.
- Various fixes for Catamount support.
- Minor update to wrapper compilers in how user-specific argv is
  ordered on the final command line.  Thanks to Jed Brown for the
  suggestions.

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