Determine if job owner should be able to repay/repost expired job rather than posting new one

[wfhio]

Some employers may have jobs that either don't get filled within a specific expiration cycle or hire for this job frequently and may not want to have to re-submit the post each time. We should evaluate adding functionality to resubmit a job with one click, either by duplicating the job or just re-using the existing post.

[wfhio]

Re-using an existing job object is probably a bad idea -- some sites like remoteOK (for example) cache job IDs and will never see the updated job. If we do add this functionality it'd be best to clone the object, keeping all fields the same except with a new job ID.