Updated btt documentation (referring to new bno_plot.py)

o  Added description of bno_plot.py, including sample screenshot
o  Various spelling clean ups
o  Updated sample btt output
o  Cleaned up table of contents

---
 btt/bno_plot.py               |    4 +-
 btt/doc/Makefile              |    2 +-
 btt/doc/bno_plot.eps          | 7696 +++++++++++++++++++++++++++++++++++++++++
 btt/doc/btt.tex               |   70 +-
 btt/doc/sample-btt-output.tex |  177 +-
 5 files changed, 7828 insertions(+), 121 deletions(-)