This simply makes it easier to browse the PostgreSQL package directory. More to
come.

Signed-off-by: Austin Seipp <aseipp@pobox.com>

This is a backwards compatible change; it mostly puts all the extensions
for postgresql in a common directory to keep them isolated.

It also moves a few things that /were not/ extensions out into other parts of
the filesystem namespace; namely the postgresql_jdbc and psqlodbc libraries
were moved under development/java-modules and development/libraries,
respectively. Because these libraries use the libpq postgresql client drivers,
they're less sensitive to underlying version changes anyway (since the protocol
is relatively stable).

No attributes were renamed or harmed in the creation of this patch.

Signed-off-by: Austin Seipp <aseipp@pobox.com>

Commit d2f39ad added them with hashes *before* normalization done
by fetchpatch.

With this, we can drop the old 1.4.0 patches for 8.4 support, since
those are now upstream.

Furthermore, SAPIC Is now bundled inside Tamarin, so we can drop the
external dependency. (This includes a patch that compiles SAPIC to
native code, much like the original, to reduce closure size.)

Signed-off-by: Austin Seipp <aseipp@pobox.com>

SAPIC is bundled with Tamarin and doesn't have separate releases
anymore; add an appropriate 'throw' clause to the alias so people know
where to find it.

Signed-off-by: Austin Seipp <aseipp@pobox.com>

Fixes NixOS/nixpkgs#54338.