Breaking lines in using/*.
Applying doc updates from BIT-1063. (Anthony Verez)

notice.rst wasn't up-to-date in this branch, so I first copied it over
from master.
Pass over the Using Bro section.

I edited the text little bit, reorganized the structure somewhat and
extended some parts. I've also simplified the tests a bit, using some
of the BTest tweaks commited in parallel.
Updating submodule.