Change the order that pg_xlog and WAL archive are polled for WAL segments.

If there is a WAL segment with same ID but different TLI present in both
the WAL archive and pg_xlog, prefer the one with higher TLI. Before this
patch, the archive was polled first, for all expected TLIs, and only if no
file was found was pg_xlog scanned. This was a change in behavior from 9.3,
which first scanned archive and pg_xlog for the highest TLI, then archive
and pg_xlog for the next highest TLI and so forth. This patch reverts the
behavior back to what it was in 9.2.

The reason for this is that if for example you try to do archive recovery
to timeline 2, which branched off timeline 1, but the WAL for timeline 2 is
not archived yet, we would replay past the timeline switch point on
timeline 1 using the archived files, before even looking timeline 2's files
in pg_xlog

Report and patch by Kyotaro Horiguchi. Backpatch to 9.3 where the behavior
was changed.
Cosmetic improvements in plpython's make rule for libpython import library.

This build technique is remarkably ugly, but that doesn't mean it has
to be unreadable too.  Be a bit more liberal with the vertical whitespace,
and give the .def file a proper dependency, just in case.
In mingw builds, make our own import library for libperl.

Borrow the method already used by plpython.  This is pretty ugly, but
it might fix the build failure exhibited by buildfarm member narwhal
since commit 846e91e0223cf9f2821c3ad4dfffffbb929cb027.

Hiroshi Inoue
Suggest shell here-documents instead of psql -c for multiple commands.

The documentation suggested using "echo | psql", but not the often-superior
alternative of a here-document.  Also, be more direct about suggesting
that people avoid -c for multiple commands.  Per discussion.
In mingw builds, make our own import library for libtcl, too.

Per buildfarm results.
Update regression testing instructions.

This documentation never got the word about the existence of check-world or
installcheck-world.  Revise to recommend use of those, and document all the
subsidiary test suites.  Do some minor wordsmithing elsewhere, too.

In passing, remove markup related to generation of plain-text regression
test instructions, since we don't do that anymore.

Back-patch to 9.1 where check-world was added.  (installcheck-world exists
in 9.0; but since check-world doesn't, this patch would need additional
work to cover that branch, and it doesn't seem worth the effort.)
Fix fat-fingered makefile changes for pltcl.

I put the OBJS assignments in the wrong order.  Per buildfarm.
Update time zone data files to tzdata release 2013i.

DST law changes in Jordan; historical changes in Cuba.

Also, remove the zones Asia/Riyadh87, Asia/Riyadh88, and Asia/Riyadh89.
Per the upstream announcement:
    The files solar87, solar88, and solar89 are no longer distributed.
    They were a negative experiment -- that is, a demonstration that
    tz data can represent solar time only with some difficulty and error.
    Their presence in the distribution caused confusion, as Riyadh
    civil time was generally not solar time in those years.