Infrastructure in place plus logic in select/linear.

select plugin

-- BLUEGENE - This fixes a race condition with dynamic mode to make it so we copy the booted and job list of blocks before trying to create.

    so the highest job priority becomes TOP_PRIORITY.

with multiple front-end nodes. Use these new fields for Cray
information. Use information in front-end table for step 
credentials and communications.

slurmdb_setup_cluster_dims(void)

    at FirstJobId.

task/affinity configured instead of when NOT configured. Patch from
Martin Perry