pgsql: Remove Wisconsin benchmark files.

Log Message:
-----------
Remove Wisconsin benchmark files.

This test is clearly not being used anymore, since it's been broken for
long periods of time without anyone noticing.  Per discussion, it's not
worth keeping in our source tree.

Removed Files:
-------------
    pgsql/src/test/bench:
        Makefile
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/Makefile)
        WISC-README
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/WISC-README)
        create.sh
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/create.sh)
        create.source
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/create.source)
        perquery
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/perquery)
        query01
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query01)
        query02
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query02)
        query03
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query03)
        query04
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query04)
        query05
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query05)
        query06
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query06)
        query07
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query07)
        query08
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query08)
        query09
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query09)
        query10
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query10)
        query11
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query11)
        query12
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query12)
        query13
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query13)
        query14
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query14)
        query15
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query15)
        query16
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query16)
        query17
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query17)
        query18
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query18)
        query19
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query19)
        query20
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query20)
        query21
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query21)
        query22
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query22)
        query23
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query23)
        query24
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query24)
        query25
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query25)
        query26
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query26)
        query27
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query27)
        query28
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query28)
        query29
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query29)
        query30
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query30)
        query31
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query31)
        query32
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/query32)
        runwisc.sh
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/runwisc.sh)
        wholebench.sh
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/wholebench.sh)