adding support for MPICH (instead of just MPICH2)
code cleanup in toolchain/mpi.py
Merge pull request #1 from boegel/mpich_fixes

code cleanup in toolchain/mpi.py
don't hardcode queue names when submitting a job
Merge pull request #1106 from boegel/no_queue

don't hardcode queue names when submitting a job
Merge pull request #1098 from ebgregory/mpich_fixes

adding support for MPICH (instead of just MPICH2)