pgsql: Stamp release 8.3RC1.

Log Message:
-----------
Stamp release 8.3RC1.

Security: CVE-2007-4769, CVE-2007-4772, CVE-2007-6067, CVE-2007-6600, CVE-2007-6601

Modified Files:
--------------
    pgsql:
        configure (r1.574 -> r1.575)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/configure?r1=1.574&r2=1.575)
        configure.in (r1.542 -> r1.543)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/configure.in?r1=1.542&r2=1.543)
    pgsql/doc:
        bug.template (r1.46 -> r1.47)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/bug.template?r1=1.46&r2=1.47)
    pgsql/src/include:
        pg_config.h.win32 (r1.47 -> r1.48)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/pg_config.h.win32?r1=1.47&r2=1.48)