pgsql: Make the COPY command return a command tag that includes the - Mailing list pgsql-committers

Log Message:
-----------
Make the COPY command return a command tag that includes the number of
rows copied.  Backend side of Volkan Yazici's recent patch, with
corrections and documentation.

Modified Files:
--------------
    pgsql/doc/src/sgml:
        protocol.sgml (r1.63 -> r1.64)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/protocol.sgml.diff?r1=1.63&r2=1.64)
    pgsql/doc/src/sgml/ref:
        copy.sgml (r1.72 -> r1.73)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/copy.sgml.diff?r1=1.72&r2=1.73)
    pgsql/src/backend/commands:
        copy.c (r1.258 -> r1.259)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/copy.c.diff?r1=1.258&r2=1.259)
    pgsql/src/backend/tcop:
        utility.c (r1.253 -> r1.254)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/tcop/utility.c.diff?r1=1.253&r2=1.254)
    pgsql/src/include/commands:
        copy.h (r1.25 -> r1.26)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/commands/copy.h.diff?r1=1.25&r2=1.26)