pgsql: Allow * as parameter for FORCE QUOTE for COPY CSV.

Log Message:
-----------
Allow * as parameter for FORCE QUOTE for COPY CSV. Itagaki Takahiro.

Modified Files:
--------------
    pgsql/doc/src/sgml/ref:
        copy.sgml (r1.85 -> r1.86)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/copy.sgml?r1=1.85&r2=1.86)
    pgsql/src/backend/commands:
        copy.c (r1.312 -> r1.313)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/copy.c?r1=1.312&r2=1.313)
    pgsql/src/backend/parser:
        gram.y (r2.671 -> r2.672)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/gram.y?r1=2.671&r2=2.672)
    pgsql/src/test/regress/expected:
        copy2.out (r1.26 -> r1.27)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/copy2.out?r1=1.26&r2=1.27)
    pgsql/src/test/regress/sql:
        copy2.sql (r1.17 -> r1.18)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/copy2.sql?r1=1.17&r2=1.18)