globals.

Convert all of the tests over to using make_bash_script.

Add new globals functions "available_nodes" and "default_partition".

places on different systems.

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