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
------
master

Details
-------
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(-)