Add src/slurmctld/front_end.[ch] with logic to build slurmctld data structure with front-end info based
upon the contents of slurm.conf

    when job preemption is configured.

    job_submit and job_modify functions as an error and the user request should
    be treated as an error.

    into an array. Patch from Gerrit Renker, CSCS.

   "FairShare" and added more detail to the sshare man page.

Fix bug where if using the slurmdbd if a job wasn't able to start right away some accounting information may be lost.

    version 2.1. Bug introduced in version 2.2.0-pre10. Patch from Par
    Andersson, NSC.

    Patch from Gerrit Renker, CSCS.

Patch from Gerrit.

    waiting for an allocation. This was broken in version 2.2.0.rc2.