pgbulkload - pgbulkload: Re-enable PARALLEL loader.

Log Message:
-----------
Re-enable PARALLEL loader.
Add new performance measurements with PostgreSQL 9.0b2 and pg_bulkload 3.0b1.
Start to support PostgreSQL 9.1.

Modified Files:
--------------
pgbulkload/bin:
Makefile (r1.13 -> r1.14)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbulkload/pgbulkload/bin/Makefile?r1=1.13&r2=1.14)
pgbulkload/doc:
index.html (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbulkload/pgbulkload/doc/index.html?r1=1.2&r2=1.3)
index_ja.html (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbulkload/pgbulkload/doc/index_ja.html?r1=1.2&r2=1.3)
pg_bulkload-ja.html (r1.7 -> r1.8)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbulkload/pgbulkload/doc/pg_bulkload-ja.html?r1=1.7&r2=1.8)
pg_bulkload.html (r1.4 -> r1.5)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbulkload/pgbulkload/doc/pg_bulkload.html?r1=1.4&r2=1.5)
pgbulkload/lib:
pg_btree.c (r1.18 -> r1.19)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbulkload/pgbulkload/lib/pg_btree.c?r1=1.18&r2=1.19)
writer_parallel.c (r1.12 -> r1.13)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbulkload/pgbulkload/lib/writer_parallel.c?r1=1.12&r2=1.13)

Added Files:
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pgbulkload/bin/expected:
load_filter-9.1.out (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbulkload/pgbulkload/bin/expected/load_filter-9.1.out?rev=1.1&content-type=text/x-cvsweb-markup)
load_function-9.1.out (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbulkload/pgbulkload/bin/expected/load_function-9.1.out?rev=1.1&content-type=text/x-cvsweb-markup)
pgbulkload/bin/sql:
load_filter-9.1.sql (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbulkload/pgbulkload/bin/sql/load_filter-9.1.sql?rev=1.1&content-type=text/x-cvsweb-markup)
load_function-9.1.sql (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbulkload/pgbulkload/bin/sql/load_function-9.1.sql?rev=1.1&content-type=text/x-cvsweb-markup)
pgbulkload/lib/nbtree:
nbtsort-9.1.c (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbulkload/pgbulkload/lib/nbtree/nbtsort-9.1.c?rev=1.1&content-type=text/x-cvsweb-markup)