[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
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.
- Clean up a bit a type mess - 4 types less. No need to have aliases
for the same thing (unification is the name).
- New macro for Johannes mysqlnd_stmt_ro_result_metadata
