Release v1.2.0.

This release introduces improved WAL configuration options and related functionality as well as some important fixes.

Features

• Added option wal_sync_on_create
• Added option wal_sync_on_close
• Renamed wal_rotate_wm to wal_size
• wal_crc enabled by default
• Added wal_recovery and ability to recover corrupted WAL (ecd7576)
• Added wal_sync_interval and background WAL fsync worker (559ddc8)

Fixes

• Fixed partition double wal write during recovery (e361e5a)
• Fixed comparator issue to related to update (5a77290)
• Improved crc32 calculation performance (3613431)