Mochiweb upgrade, bug fixes, and a few new options

Summary of changes:
   * Adding 'all_except_body' option to ts_http request subst.
   ** Using "<request subst='all_except_body'> will run substitutions on everything except body contents.
   * Adding 'mysqladmin' monitoring options to erlang monitors.
   ** Collects statistics on threads/questions on a mysql server.
  * Fixing issue with attempting to set_opts on closed socket
  * Updating mochiweb for better xpath support
  * Adding mean rate calculation to tsung_stats reports.
  * Adding --title option to set header of report
  * Applying debian spelling correction patch