have lua module reference C code to get/set job fields

  and env_array_overwrite() to wrappers for a single function to eliminate 
  duplicate code

and add his name to the team.shtml file

no change in logic

many env vars were not being set since rev 20268

BLUEGENE - Removed thread pool for destroying blocks.  It turns out the memory leak we were concerned about for creating and destroying threads in a plugin doesn't exist anymore.  This increases throughput dramatically, allowing multiple jobs to start at the same time.

    invalid features: "Job 65537 has invalid feature list: fat".