pgsql: Assorted message fixes and improvements

Assorted message fixes and improvements

Branch
------
REL9_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/a6283f97069e6f747bdc2052e9f755a9136a5edc

Modified Files
--------------
contrib/test_decoding/expected/ddl.out          |    2 +-
src/backend/access/heap/rewriteheap.c           |    4 ++--
src/backend/commands/dbcommands.c               |    6 ++++--
src/backend/commands/matview.c                  |    2 +-
src/backend/commands/tablecmds.c                |    2 +-
src/backend/executor/nodeWindowAgg.c            |    4 ++--
src/backend/replication/logical/reorderbuffer.c |    4 ++--
src/backend/replication/logical/snapbuild.c     |    6 +++---
src/backend/replication/slot.c                  |    8 ++++----
src/backend/storage/ipc/dsm_impl.c              |    6 +++---
src/test/regress/expected/matview.out           |    2 +-
11 files changed, 24 insertions(+), 22 deletions(-)