Tag appropriate files for rc3

Also performed an initial run through of upgrading our Copyright date to
extend to 2005 ... first run here was very simple ... change everything
where: grep 1996-2004 && the word 'Copyright' ... scanned through the
generated list with 'less' first, and after, to make sure that I only
picked up the right entries ...

to put more widely useful info before less widely useful info.

overlooked in 7.3 updates.  Not a critical fix but avoids a notice when
the resulting SQL script is executed.

to shared memory as soon as possible, ie, right after read_backend_variables.
The effective difference from the original code is that this happens
before instead of after read_nondefault_variables(), which loads GUC
information and is apparently capable of expanding the backend's memory
allocation more than you'd think it should.  This should fix the
failure-to-attach-to-shared-memory reports we've been seeing on Windows.
Also clean up a few bits of unnecessarily grotty EXEC_BACKEND code.

sockets, rather than failing as it formerly did.  Revert the
thereby-obsoleted patch to make psql supply the localhost default.

Per John Smith.

> * Improve the background writer
>
>   Allow the background writer to more efficiently write dirty buffers
>   from the end of the LRU cache and use a clock sweep algorithm to
>   write other dirty buffers to reduced checkpoint I/O

Per gripe from Josh Berkus.

where it doesn't belong, and put it in the psql reference page.

that is, files are sought in the same directory as the referencing file.
Also allow absolute paths in @file constructs.  Improve documentation
to actually say what is allowed in an included file.

<signal.h>.  Per Andrew Dunstan.

Update FAQ with new URL's for site.

executable file isn't itself a symlink.  We still need to run the
algorithm so that any directory symlinks in the path to the
executable are replaced by a true path.  Noticed this on seeing
pg_config give me a completely wrong answer for --pkglibdir when
I called it through a symlink to the installation bindir.

by Rod Taylor.  The foo_is_visible() functions are relatively slow and
so it pays to check them after checking the name pattern match.

index predicate uses temporary memory for evaluation.  Per example
from Jean-Gerard Pailloncy.

Fixed parsing of defines to make sure they used more than once.