limit compaction size by absolute size, not relative size #273
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Addresses observed issue where compaction sizes grew too large, causing out of memory.
The fix is to adjust the heuristics so that they never compact more than a fixed limit.
Also, the heuristics no longer suppress compaction based on the size of the mutable section since that can have unpredictable effects on log size management. Instead, compaction is now gated by a minimum on the area being compacted.