Major performance improvement to compact() #858
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compact() previously moved pages down to lower indices in a semi-random and optimistic way. However, this took O(N^2) time in the size of the database. This changes the compaction algorithm to identify the pages at the end of the database file which can be moved, and only move those pages. This is done iteratively until no more pages can be moved
heed is a wrapper around lmdb
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Fixes #852