Largish changes to in-RAM temp buckets #453
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Major changes here:
(On next we migrate buckets to disk in order of creation when we run out of disk space)
For consideration. Maybe we want to keep only some of this. This needs testing - porting it forward to next was fairly involved. It should improve performance on average new nodes; I believe I tested it quite a bit at the time, but there have been significant changes since then. There may be lock contention issues, or even full blown deadlocks etc; this is for discussion, not for immediate inclusion.