MPICH 3.1.2 released

A new stable release of MPICH, 3.1.2, is now available for download. This release contains significant enhancements to the BG/Q device, especially for RMA and shared memory functionality. It also contains enhancements to ROMIO and upgrades hwloc to 1.9.  In addition, it updates its weak alias support to align with gcc-4.x, has a better implementation of MPI_Allreduce for intercommunicator, adds more F08 test cases and fixes several bugs present in 3.1.1. All production environments are encouraged to upgrade to this release.  
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