Alterações na distribuição 3.21.7

Changed Makefile.am to take advantage of Automake 1.2.

• Added the beginnings of a benchmark suite.
• Added more secure password handling.
• Added new client function mysql_errno(), to get the error number of the error message. This makes error checking in the client much easier. This makes the new server incompatible with the 3.20.x server when running without --old-protocol. The client code is backward-compatible. More information can be found in the README file!
• Fixed some problems when using very long, illegal names.

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