pgsql: Do not write out WCOs in Query

Do not write out WCOs in Query

The WithCheckOptions list in Query are only populated during rewrite and
do not need to be written out or read in as part of a Query structure.

Further, move WithCheckOptions to the bottom and add comments to clarify
that it is only populated during rewrite.

Back-patch to 9.5 with a catversion bump, as we are still in alpha.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/4158cc3793fe0e074dcb58e91103344c8ffcd6df

Modified Files
--------------
src/backend/nodes/copyfuncs.c    |    2 +-
src/backend/nodes/equalfuncs.c   |    2 +-
src/backend/nodes/outfuncs.c     |    1 -
src/backend/nodes/readfuncs.c    |    1 -
src/include/catalog/catversion.h |    2 +-
src/include/nodes/parsenodes.h   |    6 ++++--
6 files changed, 7 insertions(+), 7 deletions(-)