pgsql: Fixed parsing of parameters.

Log Message:
-----------
Fixed parsing of parameters. Added regression test for this.

Modified Files:
--------------
    pgsql/src/interfaces/ecpg:
        ChangeLog (r1.388 -> r1.389)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ChangeLog?r1=1.388&r2=1.389)
    pgsql/src/interfaces/ecpg/preproc:
        Makefile (r1.136 -> r1.137)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/Makefile?r1=1.136&r2=1.137)
        preproc.y (r1.375 -> r1.376)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/preproc.y?r1=1.375&r2=1.376)
    pgsql/src/interfaces/ecpg/test/expected:
        sql-fetch.c (r1.11 -> r1.12)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/sql-fetch.c?r1=1.11&r2=1.12)
        sql-fetch.stderr (r1.6 -> r1.7)

(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/sql-fetch.stderr?r1=1.6&r2=1.7)
        sql-fetch.stdout (r1.1 -> r1.2)

(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/sql-fetch.stdout?r1=1.1&r2=1.2)
    pgsql/src/interfaces/ecpg/test/sql:
        fetch.pgc (r1.3 -> r1.4)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/sql/fetch.pgc?r1=1.3&r2=1.4)