Finished updates for Version 4.0.0 of the SobekCM Builder

  - (all previously committed changes)
  - Ability to ABORT restored
  - Flag added to config.xml file to indicate which instances can use the ABORT functionality
  - Creation of all static pages updated
      - All statically created HTML reviewed, cleaned
      - Default skin is now used, or specific skin if overriden by collection or item
      - Some 'UFDC' hard-coded references were found... removed
      - Item-level static pages are now created in sobek_files subfolder under items
      - All existing links reviewed and many suppressed for robot engines
  - All METS backup files are now moved to sobek_files subfolder under items
  - Final clean-up performed on each item
  - Log can be published to a location from the database setting, or config setting if multi-instance
  - Finished the update to enhance the builder db logs and fully migrate to db
  - All static pages rebuilt on first background run daily