Re-org of chart

Hi all,

I took a stab at re-factoring the chart that Harry, Evan, and Ann have been
working on into something that parallels the OSI 7-layer model. I've
attached the incomplete HTML version that I've come up with to this
message. If it seems to others to be a useful direction, I'm happy to keep
fleshing it out or collaborating with others. I want to get some feedback
before I go to far, though! :-)

Best,

b.