Version Control With Subversion Source

* src/nb/REVIEW
* src/nb/book-dist.py
* src/nb/HACKING
* src/nb/TODO
* src/nb/README
* src/nb/outline.txt
Remove a bunch of uninteresting copies of 'en' files. (If relevant
across locales, these should perhaps be moved to the top-level src/
directory.)

* src/en/book-dist.py
Move this...

* src/tools/book-dist.py
...to here, and tweak a bit for use with different locales.