pgsql: Allow WITH clauses to be attached to INSERT, UPDATE, DELETE stat

Allow WITH clauses to be attached to INSERT, UPDATE, DELETE statements.

This is not the hoped-for facility of using INSERT/UPDATE/DELETE inside
a WITH, but rather the other way around.  It seems useful in its own
right anyway.

Note: catversion bumped because, although the contents of stored rules
might look compatible, there's actually a subtle semantic change.
A single Query containing a WITH and INSERT...VALUES now represents
writing the WITH before the INSERT, not before the VALUES.  While it's
not clear that that matters to anyone, it seems like a good idea to
have it cited in the git history for catversion.h.

Original patch by Marko Tiikkaja, with updating and cleanup by
Hitoshi Harada.

Branch
------
master

Details
-------
http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=07f1264dda0e776a7e329b091c127059bce8cc54

Modified Files
--------------
doc/src/sgml/queries.sgml          |   16 +++-
doc/src/sgml/ref/delete.sgml       |   16 ++++-
doc/src/sgml/ref/insert.sgml       |   25 +++++++-
doc/src/sgml/ref/update.sgml       |   16 ++++-
src/backend/nodes/copyfuncs.c      |    3 +
src/backend/nodes/equalfuncs.c     |    3 +
src/backend/parser/analyze.c       |   40 +++++++----
src/backend/parser/gram.y          |   40 +++++++----
src/backend/parser/parse_utilcmd.c |   29 ++++++++
src/backend/utils/adt/ruleutils.c  |   13 +++-
src/include/catalog/catversion.h   |    2 +-
src/include/nodes/parsenodes.h     |    3 +
src/test/regress/expected/with.out |  133 ++++++++++++++++++++++++++++++++++++
src/test/regress/sql/with.sql      |   38 ++++++++++
14 files changed, 333 insertions(+), 44 deletions(-)