Fixed array out of bounds in position_rgb.
added back in the no_reduce option for tally accumulation for statepoint writing
user has the option of opening a file for just reading or opening a file for just writing (hdf5 only has read/write for writing)
added compiler directives around MPI calls in no_reduce tally writing
fixed a compiler directive
added back in comment for no reduce option
Merge branch 'hdf5_upgrade' of github.com:mit-crpg/openmc into hdf5_upgrade
Merge branch 'master' into hdf5_upgrade
fixed file io for new filetype capability, must be set to parallel for all procs to read dataset
switched mpi_err in mpiio interface module to mpiio_err to not conflict with global which may be used