[rucksack-devel] Btrees

[Edi Weitz]

The attached patch cleans up (at least I hope so) the btree code a bit
and adds the missing delete function and some more tests.

In particular, I convinced myself that KEY= is really not needed
although I said the opposite at the ECLM.  Also, the old version of
BTREE-NODE-INSERT sometimes split too early because it eagerly split
downwards.  The new version splits upwards and only if needed.

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