into line with rest of slurm

 o some error message cleanup

 o Some error and debug message cleanup.

Major revisions to agent.[ch] - still under development

version).

   _wait_and_destroy_prg()

   recv() didn't return all the bytes.

except the partition long output... it still looks terrible...
however, the rest looks good, I just need to add functionality if strings
are too long, and what to do.

   continuing

added needed include for elan_interconnect