* xlog_ng: (22 commits)
  [feeder] support for tagged rows
  [core] fix bug: cookie is 64 bit
  [core] default tags are negative
  [core, box] row dispatch based on tag
  [core, box] wal_write and snapshot_write row now explicitly require tag and cookie
  [core, box] support for cookie in WAL
  [core] refactor read_u{8,16,32,4}
  [core] better error handling on remote recovery
  [core] add missing exception handling when recovering WAL
  [core] flush when saving snapshot
  [core] cleanup logflushing logic
  [core] refactor io rate limiting
  [core] remove dead code
  [core, box] support for configurable behavior on recovery errors
  [core, box] move snap_io_rate_limit to module specific initialization
  [core] use buffered read when doing recovery
  [core] fix packet length calculation
  [core] close connection to feeder in case of error
  [box] now replica reports its lag
  [core] hide v04 stuff
  ...

	move: core/log_io_internal.h -> include/log_io_internal.h
	remove recovery_state accessors

* box-tree_indexes-unique:
  [box] add unique property to indexes

* xlog_ng:
  [core] indent
  [core] feeder stream versioning, refactored remote recovery
  [core] fix wording
  [core, feeder] support for v11 rows over network replication
  [core] fix feeder build
  [core] stop statistic aging if no data sources present
  [box] implicit row tags
  [core, box] implement support for v11 snap
  [core] repair magick lookup
  [core, box] factor out conversion to v11 row format
  [core] panic if recovery failed
  [core, box] unified xlog & snap io, unified robust ondisk format
  [core] add read_u16
  [core] remove dead code