process threads on a last-in first-out basis and the high thread count was
    causing unexpectedly high delays for some RPCs.

BLUEGENE - Added option to scontrol & sview to resume blocks in an error state instead of just freeing them.

    not specified by the user will be reported as "*" instead of 65534.

    Plugin API

    changing some variable names in version 2.2.0.pre5.

    avoid duplicate entries.

    priority to 0 or 1.

Better handling of select plugins that don't exist on various systems for cross cluster communication.  Slurmctld, slurmd, and slurmstepd now only load the default select plugin as well.