- Corrected some typos in the make_xxx_tables.in files.

- Made preliminary split of pre-run and run code for each
  job type. This will permit early opening of SD for reserving
  drives.
- Add offline and autochanger fields to Device Query record.
- Correct pthread_mutex_init() for autochanger in SD.
- Tweak Makefile for LaTeX manual, plus add nav buttons.