- Add back JobId index for MySQL as default -- speeds up

- Add back JobId index for MySQL as default -- speeds up
  pruning.
- Add more database fields and fix the update scripts to
  include the new items.
- Pass actual level to FD so that ClientRun editing can reflect
  correct level -- ditto for job status. This makes the DIR
  incompatible with older clients!
- Move jobq.c acquire resources to static subroutine so that
  the code logic becomes clearer. This is in preparation for
  actually using the new Device resources.
- Fix some lower case problems in sql_cmds.c reported by
  Debian.
- Correct a seg fault in the SD reported by a user. Occurred
  only when a high debug level was set.
- Modify init_dev() in dev.c to take JCR as first arg so that
  proper error messages can be reported in next item.
- Modify the query and use device SD commands to attempt to
  open the device if it could not previously be opened.
- Correct error message for Could not reserve device.
- Correct some minor details with Autochanger resource in SD.