v0.1.6

Fixed

• Unindexed position search honours cancel. for_each_position_key and
  for_each_position_key_range asked PositionQuery::cancel_with only after
  every chunk had been replayed, so a cancelled search still walked the whole
  set (minutes on the Mega Database) before reporting complete = false. The
  cancel is now asked before each chunk and every 256 games within one; a
  cancelled run replays no further games. Found when BlindBase moved its
  unindexed .cbh explorer onto this API with the early-stop predicate, and a
  superseded query kept every core busy.

Full Changelog: v0.1.5...v0.1.6