Treat NEXTVAL as an auto-generated key

Fix for issue #1298

Add ALTER VIEW RENAME command

Add Java 9+ support to NIO_CLEANER_HACK

Fix minor issues with ResultSet.getObject(..., Class) and WITH TIES

Fix JdbcPreparedStatement.set*() methods with null Calendar argument

Add initial implementation of WITH TIES clause

Update changelog and fix building of documentation

Add initial DISTINCT ON (expression, ...) implementation

Handle distinct results properly

This reverts commit 6933c751.

Assorted minor changes