pgsql: pageinspect: Support hash indexes.

pageinspect: Support hash indexes.

Patch by Jesper Pedersen and Ashutosh Sharma, with some error handling
improvements by me. Tests from Peter Eisentraut. Reviewed by Álvaro
Herrera, Michael Paquier, Jesper Pedersen, Jeff Janes, Peter
Eisentraut, Amit Kapila, Mithun Cy, and me.

Discussion: /messages/by-id/e2ac6c58-b93f-9dd9-f4e6-d6d30add7fdf@redhat.com

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/08bf6e529587e1e9075d013d859af2649c32a511

Modified Files
--------------
contrib/pageinspect/Makefile | 12 +-
contrib/pageinspect/expected/hash.out | 150 +++++++
contrib/pageinspect/hashfuncs.c | 559 ++++++++++++++++++++++++++
contrib/pageinspect/pageinspect--1.5--1.6.sql | 77 ++++
contrib/pageinspect/pageinspect.control | 2 +-
contrib/pageinspect/sql/hash.sql | 49 +++
doc/src/sgml/pageinspect.sgml | 144 +++++++
src/backend/access/hash/hashovfl.c | 8 +-
src/include/access/hash.h | 4 +
9 files changed, 995 insertions(+), 10 deletions(-)

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