[ot][spam][crazy] crazylog: append-only random-access data

[Undiscussed Horrific Abuse, One Victim of Many]

next step i think: find recent stable code, such as whatever was last posted

regarding thinking/spamming, could use more stabilisation around idea
of separating writes from flush regions into peer classes possibly
with different methods. this plan could be tuned more by planning the
semibalancing.