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:
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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)