python - lo: Add runtime parameter option.

Log Message:
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Add runtime parameter option.

This should probably be a simple action to build a dictionary,
so ./cmd.py -s foo=bar makes {'foo':'bar'}, instead of the mere
list. (Additionally, providing some syntax checks.)

Modified Files:
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lo/postgresql/utility/client:
option.py (r1.5 -> r1.6)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/lo/postgresql/utility/client/option.py.diff?r1=1.5&r2=1.6)