Allow encoding used for socket communication with the backend to be
specified as a keyword argument to PG-CONNECT, for cases where
rebinding *PG-CLIENT-ENCODING* is inconvenient.

Add a simple test for encoding support.

(From Attila Lendvai <attila.lendvai@gmail.com>)

darcs-hash:9f1f315eb332972142eadea0eff9cb70e5702ece

Code cleanups.

darcs-hash:accdbe4ec375dd9630c452cea382a94d5886ed06

Add unix-domain socket support for Allegro CL (tested with Express
edition for Linux/x86).

darcs-hash:8b5f269f3f48782be742a3e1ccbcca7f9506674c

Disabling buffering of the socket stream on CLISP greatly improves performance.

darcs-hash:407b5c85d4c3ff9659a67852f901724c703a124b

- on CL implementations that support Unix sockets, the HOST argument
   to PG-CONNECT may designate the directory containing the local
   PostgreSQL unix socket (often "/var/run/postgresql/"). The HOST
   argument is assumed to designate a local directory rather than a
   hostname when its first character is #\/. You may need to modify
   authentication options in the PostgreSQL configuration file
   pg_hba.conf to allow connections over a unix-domain socket where
   the databse username is not equal to your ident tokens. This is an
   incompatible change to previous support for unix-domain sockets
   with CMUCL (previously a HOST of NIL told pg-dot-lisp to connect
   to a unix-domain socket whose name was hardwired into the library).
   This support currently exists for SBCL, CMUCL and OpenMCL.

darcs-hash:1079feb38d33f9b9d1f14fbcd0fef67dc7954aa3

Make comparison in IMPLEMENTATION-NAME-FOR-ENCODING case-insensitive
(from ya007@yandex.ru).

darcs-hash:9fcce8a4e55f3ab822c35a64ac68e3c5846db028

Fix for encoding support for CLISP and OpenMCL (encoding still not
working correctly).

OpenMCL fix from Risto Laakso.

darcs-hash:cfadd8aec3489fe4a085f2d3781dd13c5936218c

Fix the SB-ROTATE-BYTE dependency for SBCL (was loaded twice, with
unfortunate consequences).

Add support for unix-socket connections to the backend for SBCL.

(Thanks to Andreas Fuchs)

darcs-hash:05cb2a519fdd72ffabda336b5e10b942b437fb57

Fix sockets for recent ABCL versions.

Modify the client-encoding code to work with multiple implementations
(incomplete testing).

darcs-hash:d6167b9b0a85f5c7367d7fee7b2ce9d3a8c3d961

Modified sbcl unicode support, works for me.
Moved requires into asdf package, otherwise we get asdf package problems, unknown if it works with other lisps

darcs-hash:033df81cf627c24fdcd34df9adab60e10377fd4c

Use the updated MD5 code, that operates on octet arrays rather than
strings.

darcs-hash:bde42a8e54d275e9eda02c5739ce30eb4f539d59

Three fixes from Björn Lindberg <d95-bli@nada.kth.se>:

   - Two trivial bugs with regards to use with Allegro

   - Handling of the special timestamp values infinity and -infinity. They
     gave an error, but now returns the symbols :INFINITY and :-INFINITY
     respectively.

   - A bug in the version 3 of the protocol, where it would return NIL for
     fields in the database containing the empty string, rather than an
     empty string.

darcs-hash:504e8e152c17d5b4a0d4aa402c8fe52e71647eef

possible sbcl unicode fix

darcs-hash:75a1e1f1e739be63e245fb64a12241fca0a79672

add a file that does a manual load of pg

darcs-hash:ebc3809f360389db9d6269f534e5c184398afbb7

- add md5 authentication (thanks to Brian Mastenbrook). Uses Pierre Mai's
    portable md5.lisp library, that has been added to the project (with extra
    EVAL-WHENness to please OpenMCL and ACL).

    Tested with CMUCL, SBCL, OpenMCL, CLISP, ACL 6.1. ABCL does not compile
    md5.lisp, probably for more EVAL-WHEN reasons. Only tested with PostgreSQL
    version 7.4.

darcs-hash:76581bd5b619a8e593164743a8ff044357c680cb

- changes for Armed Bear Lisp: change to new API for binary socket
   streams; autoload a working FORMAT

darcs-hash:3d3084bba5d1542f6c1200c0ff7cbae4439c7c62

- improvements to the system-dependent functionality: OpenMCL is
    able to use a local connection to the backend; most
    implementations resignal connection errors as a postgres-error.

  - fixes to the lowlevel code

darcs-hash:81350b160619ff22468166aa3f1928c8f75d9b7e

Integrate Peter Van Eynde's v3 protocol support:

   - create PGCON-V2 and PGCON-V3 classes
   - PG-CONNECT attempts to connect using v3 protocol, and falls back
     to v2 protocol for older backends; return a PGCON-V2 or PGCON-V3
     object
   - PG-EXEC and FN and PG-DISCONNECT are generic functions that
     dispatch on the connection type
   - protocol code split into v2-protocol.lisp and v3-protocol.lisp

TBD: cleaning up the notification & error reporting support, and
factorizing more code between the two protocol versions.

Also split code out into multiple files:

   - large-object support
   - metainformation about databases
   - parsing and type coercion support
   - utility functions and macros

darcs-hash:00b6e900f7b48953d959f95e55c26ecee52efb37

initial import

darcs-hash:3eba5477bf5e3b095b88e97e474746b61304a343