[DOC] This makes mysql_refresh() as described in
http://dev.mysql.com/doc/refman/6.0/en/mysql-refresh.html
available as mysqli_Refresh() and mysqli->refresh()
MYSQLI_REFRESH_BACKUP_LOG is only available when linking libmysql 6.0
or mysqlnd
Now --with-mysql-sock controls all mysql extensions. If provided it will be
the default value as it was set in php.ini . php.ini will override it for
ext/mysql and ext/mysqli but not for pdo_mysql
Bug #44352 mysqli_connect_error() false negative for host errors
From now on the mysqli object doesn't have that magic properties, like
error, which were readable but not visible through isset(), property_exists()
and var_dump(). All other ext/mysqli classes were fixed too.
Now it will be easier to debug mysqli based applications.
Clearly separated fetching (physical reading) from decoding phases (data
interpretation). Threaded fetching added but disabled as needs more work for
Windows. For Linux needs some touches to add pthreads if this is enabled,
probably with a compile-time switch.
The code reorganisation makes it easy to add also async API, similar to
cURL's one.
