This reverts `bookkeeper: only read listchannelmoves 1000 entries at a time.` commit,
so we can properly fix the scalability in the coming patches.
tests/test_coinmoves.py::test_generate_coinmoves (100,000):
Time (from start to end of l2 node): 207 seconds
Worst latency: 106 seconds
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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