srun command.

global conf->node_name string.

added some bgl specs back into the job_desc_msg_t so lcrm can use bgl specs for job creation.  Also changed all slurm_auth_cred's to auth_cred instead of just cred.

PlugStackConfig and UsePAM. Update some related documentation.

gid must be the root user.  Therefore we need to reclaim the effective
gid in _become_user() before dropping real, effective, and saved gids.

Likewise for setreuid().

validate the memory size.

PAM to support SLURM (under the UsePAM) option.

for consistency across slurm

for consistency across slurm

Change avoids this error:
  expected integer but got "08" (looks like invalid octal number)

No changes in logic.

    from "MM/DD HH:MM:SS" to "YYYY-MM-DD HH:MM:SS", conforming with the ISO8601
    standard format.