Added code to content module to delete content (and files) marked with delete_flag = 1.  Same for advise module, admin, and comments modules.

  Fixed bug to where if you try to view content which doesn't exist, we go to a 404 error.

  Removed getting variables in settings.php file.  Instead, they will be "lazy-loaded" as-needed.  Altered stats module to make sure to use variable_get() syntax
  instead of trying to load directly from globals array.