Add support for renaming constraints

reviewed by Josh Berkus and Dimitri Fontaine

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/39d74e346c083aa371ba64c4edb1332c40b56530

Modified Files
--------------
doc/src/sgml/ref/alter_table.sgml         |   16 +++-
src/backend/commands/alter.c              |    4 +
src/backend/commands/tablecmds.c          |  102 ++++++++++++++++++++++
src/backend/parser/gram.y                 |   10 ++
src/include/commands/tablecmds.h          |    2 +
src/test/regress/expected/alter_table.out |  135 +++++++++++++++++++++++++++++
src/test/regress/sql/alter_table.sql      |   40 +++++++++
7 files changed, 306 insertions(+), 3 deletions(-)

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