[COMMITTERS] pgsql: Add psql variables to track success/failure of SQL queries.

Add psql variables to track success/failure of SQL queries.

This patch adds ERROR, SQLSTATE, and ROW_COUNT, which are updated after
every query, as well as LAST_ERROR_MESSAGE and LAST_ERROR_SQLSTATE,
which are updated only when a query fails.  The expected usage of these
is for scripting.

Fabien Coelho, reviewed by Pavel Stehule

Discussion: https://postgr.es/m/alpine.DEB.2.20.1704042158020.12290@lancre

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/69835bc8988812c960f4ed5aeee86b62ac73602a

Modified Files
--------------
doc/src/sgml/ref/psql-ref.sgml     |  44 +++++++++++++
src/bin/psql/common.c              |  71 ++++++++++++++++++++
src/bin/psql/help.c                |  11 +++-
src/bin/psql/startup.c             |   4 ++
src/test/regress/expected/psql.out | 131 +++++++++++++++++++++++++++++++++++++
src/test/regress/sql/psql.sql      |  64 ++++++++++++++++++
6 files changed, 324 insertions(+), 1 deletion(-)


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