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Re-implement psql's FETCH_COUNT feature atop libpq's chunked mode.

Formerly this was done with a cursor, which is problematic since not all result-set-returning query types can be put into a cursor. The new implementation is better integrated into other psql features, too. Daniel Vérité, reviewed by Laurenz Albe and myself (and whacked around a bit by me, so any remaining bugs are my fault) Discussion: https://postgr.es/m/CAKZiRmxsVTkO928CM+-ADvsMyePmU3L9DQCa9NwqjvLPcEe5QA@mail.gmail.com

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src
- bin/psql
  - common.c
  - t
    - 001_basic.pl
- test/regress
  - expected
    - psql.out
  - sql
    - psql.sql

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