[MySQL][Spider]Spider storage engine 0.15 released

I'm pleased to announce the release of Spider storage engine version 0.15.(beta)

The main changes in this version are following.
- Add table parameter "auto_increment_mode".
- Add server parameter "spider_auto_increment_mode".
  Spider supports 3 modes.
  0:Use a count that Spider get from the remote server with exclusive lock for auto increment value.
  1:Use a count that Spider has internal for auto increment value.
  2:Auto increment value is given by the remote server.

- Add server parameter "spider_ping_interval_at_trx_start".
  Performance improvement by frequency decrease of checking broken connections.

Please see "99_change_logs.txt" in the download documents for checking other changes.


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