Alterações na distribuição 3.21.13

Added retry of interrupted reads and clearing of errno. This makes Linux systems much safer!

• Fixed locking bug when using many aliases on the same table in the same SELECT.
• Fixed bug with LIKE on number key.
• New error message so you can check whether the connection was lost while the command was running or whether the connection was down from the start.
• Added --table option to MariaDB to print in table format. Moved time and row information after query result. Added automatic reconnect of lost connections.
• Added != as a synonym for <>.
• Added function VERSION() to make easier logs.
• New multi-user test tests/fork_test.pl to put some strain on the thread library.

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