pgsql: For protocol-level prepare/bind/execute: o print user name for

Log Message:
-----------
For protocol-level prepare/bind/execute:

    o  print user name for all
    o  print portal name if defined for all
    o  print query for all
    o  reduce log_statement header to single keyword
    o  print bind parameters as DETAIL if text mode

Modified Files:
--------------
    pgsql/doc/src/sgml:
        config.sgml (r1.71 -> r1.72)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/config.sgml.diff?r1=1.71&r2=1.72)
    pgsql/src/backend/commands:
        portalcmds.c (r1.48 -> r1.49)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/portalcmds.c.diff?r1=1.48&r2=1.49)
        prepare.c (r1.58 -> r1.59)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/prepare.c.diff?r1=1.58&r2=1.59)
    pgsql/src/backend/executor:
        spi.c (r1.152 -> r1.153)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/spi.c.diff?r1=1.152&r2=1.153)
    pgsql/src/backend/tcop:
        postgres.c (r1.495 -> r1.496)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/tcop/postgres.c.diff?r1=1.495&r2=1.496)
    pgsql/src/backend/utils/mmgr:
        portalmem.c (r1.90 -> r1.91)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mmgr/portalmem.c.diff?r1=1.90&r2=1.91)
    pgsql/src/include/utils:
        portal.h (r1.63 -> r1.64)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/utils/portal.h.diff?r1=1.63&r2=1.64)