Improved robust of scraping process:
   * try/catch blocks around database calls
   * add len checking to some of the housing location functions to prevent
     indexing errors
Modified cron script to run code in parallel using GNU parallel program, which
runs shell processes in parallel. Added new process discharge_inmates so that
discharging of inmates still occurs with parallel processing. Using parallel
processing on my MacBook Pro laptop, processing time dropped from 4 1/2 hours
to 46 minutes. During that time processed 10,921 inmate records.