In SLURM, by default, all environment variables are exported to the job, leading to a variety of confusing errors.  This change disables exporting of variables so that only the ones in <envar> blocks are exported.
In SLURM, by default, all environment variables are exported to the job, leading to a variety of confusing errors.  This change disables exporting of variables so that only the ones in <envar> blocks are exported.

christopherwharrop/rocoto,christopherwharrop/rocoto