pgloader - pgloader: First implementation of Round Robin Reader

Log Message:
-----------
First implementation of Round Robin Reader threading method, Work In Progress --- does not work at all yet

Modified Files:
--------------
    pgloader/examples/parallel:
        parallel.sql (r1.1 -> r1.2)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgloader/pgloader/examples/parallel/parallel.sql.diff?r1=1.1&r2=1.2)
    pgloader/pgloader:
        options.py (r1.17 -> r1.18)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgloader/pgloader/pgloader/options.py.diff?r1=1.17&r2=1.18)
        pgloader.py (r1.27 -> r1.28)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgloader/pgloader/pgloader/pgloader.py.diff?r1=1.27&r2=1.28)
        reader.py (r1.9 -> r1.10)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgloader/pgloader/pgloader/reader.py.diff?r1=1.9&r2=1.10)
        tools.py (r1.9 -> r1.10)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgloader/pgloader/pgloader/tools.py.diff?r1=1.9&r2=1.10)