Initial nostrdb relay subscriptions (William Casarin)

test: add another url parsing test (William Casarin)

disable lmdb download (William Casarin)

blocks: add ndb_blocks_flags function (William Casarin)

fix: don't write the owned flag to the DB (William Casarin)

test: make sure the block types are correct (William Casarin)

fix clang compile issue (William Casarin)

blocks: expose block iterator internals (William Casarin)

pushed to nostrdb:refs/heads/master

http://git.jb55.com/nostrdb/commit/f4e2057db5e08efb6c400ee4c9fdeb308f14ffca.html