Alterações na distribuição 3.19.5

Some new functions, some more optimization on joins.

• Should now compile clean on Linux (2.0.x).
• Added functions DATABASE(), USER(), POW(), LOG10() (needed for ODBC).
• In a WHERE with an ORDER BY on fields from only one table, the table is now preferred as first table in a multi-join.
• HAVING and IS NULL or IS NOT NULL now works.
• A group on one column and a sort on a group function (SUM(), AVG()...) didn't work together. Fixed.
• mysqldump: Didn't send password to server.

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