Change JSONB's on-disk format for improved performance.

The original design used an array of offsets into the variable-length
portion of a JSONB container.  However, such an array is basically
uncompressible by simple compression techniques such as TOAST's LZ
compressor.  That's bad enough, but because the offset array is at the
front, it tended to trigger the give-up-after-1KB heuristic in the TOAST
code, so that the entire JSONB object was stored uncompressed; which was
the root cause of bug #11109 from Larry White.

To fix without losing the ability to extract a random array element in O(1)
time, change this scheme so that most of the JEntry array elements hold
lengths rather than offsets.  With data that's compressible at all, there
tend to be fewer distinct element lengths, so that there is scope for
compression of the JEntry array.  Every N'th entry is still an offset.
To determine the length or offset of any specific element, we might have
to examine up to N preceding JEntrys, but that's still O(1) so far as the
total container size is concerned.  Testing shows that this cost is
negligible compared to other costs of accessing a JSONB field, and that
the method does largely fix the incompressible-data problem.

While at it, rearrange the order of elements in a JSONB object so that
it's "all the keys, then all the values" not alternating keys and values.
This doesn't really make much difference right at the moment, but it will
allow providing a fast path for extracting individual object fields from
large JSONB values stored EXTERNAL (ie, uncompressed), analogously to the
existing optimization for substring extraction from large EXTERNAL text
values.

Bump catversion to denote the incompatibility in on-disk format.
We will need to fix pg_upgrade to disallow upgrading jsonb data stored
with 9.4 betas 1 and 2.

Heikki Linnakangas and Tom Lane
Revert 95d737ff to add 'ignore_nulls'

Per discussion, revert the commit which added 'ignore_nulls' to
row_to_json.  This capability would be better added as an independent
function rather than being bolted on to row_to_json.  Additionally,
the implementation didn't address complex JSON objects, and so was
incomplete anyway.

Pointed out by Tom and discussed with Andrew and Robert.
Also revert e3ec0728, JSON regression tests

Managed to forget to update the other JSON regression test output,
again.  Revert the commit which fixed it before.

Per buildfarm.
doc fix for pg_recvlogical: --create doesn't immediately exit.

Author: Michael Paquier
pg_upgrade:  have pg_upgrade fail for old 9.4 JSONB format

Backpatch through 9.4
Fix pg_dump's --if-exists for large objects

This was born broken in 9067310cc5dd590e36c2c3219dbf3961d7c9f8cb.

Per trouble report from Joachim Wieland.

Pavel Stěhule and Álvaro Herrera
merge master