[Tile-serving] [openstreetmap/osm2pgsql] Memory released too late for the main cache ? (#1559)

[Jochen Topf]

I looked into this and you are right, we could release cache memory earlier. I have no idea how much this will actually improve performance, because the memory is unused and so it should eventually be purged from memory anyway. But it should be fixed in any case. I have some code changes, but they need more tests. 

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