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namedb/lmdb: make sure the freelist can always hold db tree index

Ghost User requested to merge lmdb-reserve-pages into master

Disclaimer: It's been a WIP for so long time that I have forgotten about this.

The size-limited LMDB instance may be filled completely to a point where you cannot delete it, as there won't be any free pages left. This code makes sure there are always enough free pages to delete the complete DB.

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