Alterações na distribuição 3.21.30

MariaDB now returns an exit code > 0 if the query returned an error.

Saving of command-line history to file in MariaDB client. By Tommy Larsen <tommy@mix.hive.no>.
Fixed problem with empty lines that were ignored in mysql.cc.
Save the pid of the signal handler thread in the pid file instead of the pid of the main thread.
Added patch by <tommy@valley.ne.jp> to support Japanese characters SJIS and UJIS.
Changed safe_mysqld to redirect startup messages to 'hostname'.err instead of 'hostname'.log to reclaim file space on mysqladmin refresh.
ENUM always had the first entry as default value.
ALTER TABLE wrote two entries to the update log.
sql_acc() now closes the MariaDB grant tables after a reload to save table space and memory.
Changed LOAD DATA to use less memory with tables and BLOB columns.
Sorting on a function which made a division / 0 produced a wrong set in some cases.
Fixed SELECT problem with LEFT() when using the czech character set.
Fixed problem in isamchk; it couldn't repair a packed table in a very unusual case.
SELECT statements with & or | (bit functions) failed on columns with NULL values.
When comparing a field = field, where one of the fields was a part key, only the length of the part key was compared.