up to 2.2.20 (released 2016-12-09)

up to 2.2.20 (released 2016-12-09)

 * Fixed bug 1362942: pt-slave-restart fails on MariaDB 10.0.13 (gtid_mode confusion)
 * Fixed bug 1566556: pt-show-grants fails against MariaDB10+
 * Feature   1604834: pt-query-digest numbers in table or column names converted to question marks (--preserve-embedded-numbers)
 * Fixed bug 1613915: pt-online-schema-change misses data.  Fixed sort order for ENUM fields
 * Fixed bug 1625005: pt-online-schema-change doesn't apply underscores to foreign keys individually
 * Fixed bug 1634900: pt-upgrade fails with SELECT INTO
 * Fixed bug 1635734: pt-slave-restart --config does not recognize = as separator
 * Feature   1636068: Added pause to NibbleIterator
 * Feature   1638293: --data-dir parameter in order to create the table on a different partition
 * Feature   1639052: with pt-table-checksum automatically exclude checking schemas named percona, percona_schema
 * Feature   1642364: pt-online-schema-change Added --remove-data-dir feature
 * Feature   1643914: Fixed several typos in the doc (Thanks Dario Minnucci)
 * Feature   1643940: Add Transparent huge pages info to pt-summary
 * Feature   1643941: Add Memory management library to pt-mysql-summary