Alterações na distribuição 3.21.27

Added user level lock functions GET_LOCK(string,timeout), RELEASE_LOCK(string).

• Added Opened_tables to show status.
• Changed connect timeout to 3 seconds to make it somewhat harder for crackers to kill mysqld through telnet + TCP/IP.
• Fixed bug in range optimiser when using WHERE key_part_1 >= something AND key_part_2 <= something_else.
• Changed configure for detection of FreeBSD 3.0 9803xx and above
• WHERE with string_col_key = constant_string didn't always find all rows if the column had many values differing only with characters of the same sort value (like e and e with an accent).
• Strings keys looked up with 'ref' were not compared in case-sensitive fashion.
• Added umask() to make log files non-readable for normal users.
• Ignore users with old (8-byte) password on startup if not using --old-protocol option to mysqld.
• SELECT which matched all key fields returned the values in the case of the matched values, not of the found values. (Minor problem.)

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