Alterações na distribuição 3.21.16

Added ODBC 2.0 & 3.0 functions POWER(), SPACE(), COT(), DEGREES(), RADIANS(), ROUND(2 arg) and TRUNCATE().

• Warning: Incompatible change! LOCATE() parameters were swapped according to ODBC standard. Fixed.
• Added function TIME_TO_SEC().
• In some cases, default values were not used for NOT NULL fields.
• Timestamp wasn't always updated properly in UPDATE SET ... statements.
• Allow empty strings as default values for BLOB and TEXT, to be compatible with mysqldump.

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