Move PyGreSQL usage documentation from README into DocBook. Some other

editing.

src/interfaces/python/README.linux

-Thanks to thilo@eevolute.com and others for this README and the RPM
-
-Note: The precompiled RPM package is not available at www.eevolute.com.
-  You may use the spec file provided with PyGreSQL to build your
-  own package.
-    Hartmut Goebel <hartmut@goebel.noris.de>
-
-
-INSTALLING PyGreSQL on Redhat Linux 5.1 or 5.2
-==============================================
-
-Things are pretty easy on Redhat Linux.  You can either get a precompiled
-RPM package from
-
-        ftp://www.eevolute.com/pub/python/
-
-or try in compile and install it yourself:
-
-bash$ make redhat       # this just compiles the module as a shared object
-cc -fpic -shared -o _pg.so -I/usr/include/python1.5 pgmodule.c -lpq
-bash$ python            # you can test it from your local directory
-Python 1.5.1 (#1, May  6 1998, 01:48:27)  [GCC 2.7.2.3] on linux-i386
-Copyright 1991-1995 Stichting Mathematisch Centrum, Amsterdam
->>> import _pg
->>> db = _pg.connect('thilo', 'localhost')
->>> db.query("INSERT INTO test VALUES ('ping', 'pong')")
-18304
->>> db.query("SELECT * FROM test")
-eins|zwei
-----+----
-ping|pong
-(1 row)
-
-bash$ su                # Yow! Seems to work - now install it properly
-bash# cp _pg.so /usr/lib/python1.5/lib-dynload 
-
-done!
-
-Oliver White (ojw@muzak.iinet.net.au) sent me the following information
-about installing on Debian.
-
-Hi, I thought you might want to upgrade your documentation for PyGreSQL
-to let people know they can get it by simply typing 'apt-get install
-python-pygresql', on debian (duh). This would have saved me a lot of
-trouble.
-