Undo autoconf 2.69's attempt to #define _DARWIN_USE_64_BIT_INODE.

Defining this symbol causes OS X 10.5 to use a buggy version of readdir(),
which can sometimes fail with EINVAL if the previously-fetched directory
entry has been deleted or renamed.  In later OS X versions that bug has
been repaired, but we still don't need the #define because it's on by
default.  So this is just an all-around bad idea, and we can do without it.
Don't attempt to limit target database for pg_restore.

There was an apparent attempt to limit the target database for
pg_restore to version 7.1.0 or later.  Due to a leading zero this
was interpreted as an octal number, which allowed targets with
version numbers down to 2.87.36.  The lowest actual release above
that was 6.0.0, so that was effectively the limit.

Since the success of the restore attempt will depend primarily on
on what statements were generated by the dump run, we don't want
pg_restore trying to guess whether a given target should be allowed
based on version number.  Allow a connection to any version.  Since
it is very unlikely that anyone would be using a recent version of
pg_restore to restore to a pre-6.0 database, this has little to no
practical impact, but it makes the code less confusing to read.

Issue reported and initial patch suggestion from Joel Jacobson
based on an article by Andrey Karpov reporting on issues found by
PVS-Studio static code analyzer.  Final patch based on analysis by
Tom Lane.  Back-patch to all supported branches.
Extract restriction OR clauses whether or not they are indexable.

It's possible to extract a restriction OR clause from a join clause that
has the form of an OR-of-ANDs, if each sub-AND includes a clause that
mentions only one specific relation.  While PG has been aware of that idea
for many years, the code previously only did it if it could extract an
indexable OR clause.  On reflection, though, that seems a silly limitation:
adding a restriction clause can be a win by reducing the number of rows
that have to be filtered at the join step, even if we have to test the
clause as a plain filter clause during the scan.  This should be especially
useful for foreign tables, where the change can cut the number of rows that
have to be retrieved from the foreign server; but testing shows it can win
even on local tables.  Per a suggestion from Robert Haas.

As a heuristic, I made the code accept an extracted restriction clause
if its estimated selectivity is less than 0.9, which will probably result
in accepting extracted clauses just about always.  We might need to tweak
that later based on experience.

Since the code no longer has even a weak connection to Path creation,
remove orindxpath.c and create a new file optimizer/util/orclauses.c.

There's some additional janitorial cleanup of now-dead code that needs
to happen, but it seems like that's a fit subject for a separate commit.
Remove dead code now that orindxpath.c is history.

We don't need make_restrictinfo_from_bitmapqual() anymore at all.
generate_bitmap_or_paths() doesn't need to be exported, and we can
drop its rather klugy restriction_only flag.
Fix alphabetization in catalogs.sgml.

Some recent patches seem not to have grasped the concept that the catalogs
are described in alphabetical order.
Fix broken support for event triggers as extension members.

CREATE EVENT TRIGGER forgot to mark the event trigger as a member of its
extension, and pg_dump didn't pay any attention anyway when deciding
whether to dump the event trigger.  Per report from Moshe Jacobson.

Given the obvious lack of testing here, it's rather astonishing that
ALTER EXTENSION ADD/DROP EVENT TRIGGER work, but they seem to.
Do not use an empty hostname.

When trying to connect to a given database libecpg should not try using an
empty hostname if no hostname was given.
Rename walLogHints to wal_log_hints for easier grepping.

Michael Paquier
Fix contrib/pg_upgrade to clean all the cruft made during "make check".

Although these files get cleaned up if the test runs to completion,
a failure partway through leaves trash all over the floor.  The Makefile
ought to be bright enough to get rid of it when you say "make clean".
Merge branch 'master' of git://git.postgresql.org/git/postgresql into rollups_branch