bloom: constify u8s.
undup-fuse: constify and u8ify bufs throughout
undup-fuse: tie into bloom
undup-fuse: add and fixup some debug to track down bloom caused lossage
lookup_hash: add debug on bloom possible
add bloom_dump and dump_blooms and use them to track down write lossage
bloom: implement bloom_weight and use it to improve bloom_dump
more dump_blooms
lookup_hash: correctly insert *all* hashes rather than repeatedly re-inserting same hash