pgsql: Gettext plural support In the backend, I changed only a handful

Log Message:
-----------
Gettext plural support

In the backend, I changed only a handful of exemplary or important-looking
instances to make use of the plural support; there is probably more work
there.  For the rest of the source, this should cover all relevant cases.

Modified Files:
--------------
    pgsql/src/backend/catalog:
        dependency.c (r1.86 -> r1.87)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/dependency.c?r1=1.86&r2=1.87)
        pg_proc.c (r1.161 -> r1.162)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/pg_proc.c?r1=1.161&r2=1.162)
        pg_shdepend.c (r1.31 -> r1.32)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/pg_shdepend.c?r1=1.31&r2=1.32)
    pgsql/src/backend/executor:
        execQual.c (r1.241 -> r1.242)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/execQual.c?r1=1.241&r2=1.242)
    pgsql/src/backend/parser:
        parse_func.c (r1.211 -> r1.212)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_func.c?r1=1.211&r2=1.212)
    pgsql/src/backend/postmaster:
        bgwriter.c (r1.56 -> r1.57)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/bgwriter.c?r1=1.56&r2=1.57)
    pgsql/src/bin/pg_dump:
        pg_backup_archiver.c (r1.168 -> r1.169)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_backup_archiver.c?r1=1.168&r2=1.169)
        pg_backup_tar.c (r1.63 -> r1.64)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_backup_tar.c?r1=1.63&r2=1.64)
        pg_dump.c (r1.530 -> r1.531)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_dump.c?r1=1.530&r2=1.531)
    pgsql/src/bin/psql:
        describe.c (r1.202 -> r1.203)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/describe.c?r1=1.202&r2=1.203)
        print.c (r1.110 -> r1.111)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/print.c?r1=1.110&r2=1.111)
    pgsql/src/include:
        c.h (r1.234 -> r1.235)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/c.h?r1=1.234&r2=1.235)
    pgsql/src/interfaces/ecpg/preproc:
        variable.c (r1.47 -> r1.48)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/variable.c?r1=1.47&r2=1.48)
    pgsql/src/pl/plpgsql/src:
        pl_exec.c (r1.235 -> r1.236)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/pl_exec.c?r1=1.235&r2=1.236)
    pgsql/src/pl/plpython:
        plpython.c (r1.118 -> r1.119)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpython/plpython.c?r1=1.118&r2=1.119)