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State of MERGE between MariaDB 5.5 and MySQL 5.6.5

Featured copied/merged
- storage/innodb/*
- storage/perfschema
- sql/share/errmsg-utf8.txt
- All CF_XXX states in sql_class.h.
- handler error messages.
- Removed timestamp handling from all handler::write and handler::update
  methods.

Features recoded
- Better error messages
- Added support of timestamps to ha_write and ha_update.

Fetures half done:
- Support for TRANSACTION READ ONLY | READ WRITE
- CF_XXX states added to init_update_queries() but not otherwise used.

Short time TODO:
- Add support for TRANSACTION READ ONLY | READ WRITE in sql_yacc.yy
  (support for variable tx_read_only)

- merge hostname.cc / hostname.h
- add support for host_error()

- Enable performance_schema.host_cache in scripts/mysql_system_tables.sql

- Add full support for timestamp. (remove timestamp handling from ha_write())