code on Nostr: Initial nostrdb queries (William Casarin) cursor: fix bug when pushing last element ...

Initial nostrdb queries (William Casarin)
cursor: fix bug when pushing last element (William Casarin)
query: extract ndb_cursor_start (William Casarin)
cursor: remove old array code (William Casarin)
filter: don't allow adding id elements on kinds (William Casarin)
ocd: small cleanup (William Casarin)

pushed to nostrdb:refs/heads/master
http://git.jb55.com/nostrdb/commit/c00473a296d69f3ac5db2c814beaf0e75eb0b3a5.html