pgsql: Change SET LOCAL/CONSTRAINTS/TRANSACTION and ABORT behavior

Change SET LOCAL/CONSTRAINTS/TRANSACTION and ABORT behavior

Change SET LOCAL/CONSTRAINTS/TRANSACTION behavior outside of a
transaction block from error (post-9.3) to warning. (Was nothing in <=
9.3.) Also change ABORT outside of a transaction block from notice to
warning.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/a6542a4b6870a019cd952d055d2e7af2da2fe102

Modified Files
--------------
doc/src/sgml/ref/abort.sgml | 3 +--
doc/src/sgml/ref/rollback.sgml | 4 ++--
doc/src/sgml/ref/set.sgml | 5 ++---
doc/src/sgml/ref/set_constraints.sgml | 5 +----
doc/src/sgml/ref/set_transaction.sgml | 2 +-
src/backend/access/transam/xact.c | 37 ++++++++++++++++++++++++++-------
src/backend/tcop/utility.c | 2 +-
src/backend/utils/misc/guc.c | 10 ++++-----
src/include/access/xact.h | 1 +
src/test/regress/expected/errors.out | 2 +-
src/test/regress/expected/guc.out | 4 ++--
11 files changed, 47 insertions(+), 28 deletions(-)