Version 17.1

This is a maintenance release to fix several issues reported in new
TEST action. There is also some feature improvement:

• Add OPTIONS (key 'true') on table FDW export when a column is detected as a primary key.
• Add DELETE configuration directive that allow a similar feature than the WHERE clause to replace TRUNCATE call by a "DELETE FROM table WHERE condition". This feature can be useful with regular "updates". Thanks to Sebastien Albert for the feature request.

Here is the complete list of other changes:

• Fix the counter of user defined types and sequences in TEST action
• Fix COPY import of data from column with user defined type with NULL value.
• Fix DBD::Pg segmentation fault with direct INSERT import from column with user defined type.
• Fix TEST action with multiple PG_SCHEMA export. Thanks to Michael Vitale for the report.
• Fix documentation about PG_SCHEMA