Fix postfix increment operator in Settings::iterator

Link rdkafka with bundled SASL

fix data race in rename query

Implementation of geohashEncode and geohashDecode functions;

Fix perf regression: do not add right join key to result if possible

Regression methods

Fix bunch of flapping perf tests. Improve average speed calculation

DOCAPI-3822: ZooKeeper settings. Oracle ODBC issue.

Update quick start on website front page

...as skipping parts that were marked as optional indeed fails the rest of it.

Add San Francisco meetup link

also enable SASL SCRAM support in the code.

Remove past Meetup link

IPv4 and IPv6 domain docs.

Fix if, multiIf's nullable bug.

feat alter:  parallelize processing of parts in alter modify

Function signatures:
 * geohashEncode(float lon, float lat, int precision) => string

 * geohashDecode(string encoded) => (float llon, float lat)

With test cases and documentation;

Suport settings for async distributed inserts (#4852)