_hash_index() in src/common/node_conf.c. Add logic to insure non-negative index
in both functions. 

    The logic has been added to select/linear and select/cons_res, but will
    not be enabled until the other select plugins are modified.

Infrastructure in place plus logic in select/linear.

    indicate job termination was due to preemption.

    "*** JOB 65547 CANCELLED AT 2011-01-21T12:59:33 DUE TO PREEMPTION ***".

Added flag "NoReserve" to a QOS to make it so all jobs are created equal within a QOS.  So if larger, higher priority jobs are unable to run they don't prevent smaller jobs from running even if running the smaller jobs delay the start of the larger, higher priority jobs.

BLUEGENE - fixed issue where jobs wouldn't wait log enough for blocks to free and wanted to use blocks that are being freed for other jobs

not all nodes have the same number of allocated CPUs.

select plugin

scheduling is configured.

-- 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.