Fix #3676: enable mpi in dev
Fix #3676: enable mpi in dev

NERSC is working as configured.

mkeilman/sirepo,radiasoft/sirepo,mkeilman/sirepo,radiasoft/sirepo,mkeilman/sirepo,mkeilman/sirepo,radiasoft/sirepo,radiasoft/sirepo,radiasoft/sirepo