Fix ON DUPLICATE KEY UPDATE for inserts with multiple rows

Parse TIME WITHOUT TIME ZONE and fix TIMESTAMP as column name

Update JTS to version 1.15.0 from LocationTech

Assorted changes in help.csv

Parse more variants of timestamps with time zones

TIMESTAMP WITHOUT TIME ZONE, TIMEZONE_HOUR, and TIMEZONE_MINUTE

Assorted minor changes in Parser

Update documentation of date-time types and clean up related code a bit

Implement conversions for TIMESTAMP WITH TIME ZONE

Fix two-phase commit in MVStore