Begin work on the Risks and Unknowns
Reword some portions of the accelerometer risk.
Reword some stuff in the R/U.

Remove a first person mention and change some clunky wording.
Make entropy lower case in one place.
Add some notes.
Add some about how the hwrng might hurt us.
Remove one of the notes.

If we aren't going to explicitly talk about how we are going to do the testing
for the ``walk around'' portion, then it is not worth bringing up here.
Talk about if this is already being added to the pool.
s/DIEBOLD/DIEHARD/
Add more about why the R/U section is necessary.

Fluff Fluff, BS BS...
Incorporate the Risks and Unknowns.
Merge branch 'risks_and_unknowns'