de-uglified X Protocol description

[Thien-Thi Nguyen]

i forgot to mention in the last message that the dataset on which
`(ttn-do zzz x-protocol)' is built is also online:

 http://www.gnuvola.org/data/

observant (source code) readers will note that much of the data is
meticulously collected and then ignored (by x-protocol.learn).
all this means is that there are "code enhancement opportunities"
ahead (-: and perhaps behind, as well).

ok, back to the grindstone...

thi