[osg-submissions] Passing plugin options to files inside an archive

[Glenn Waldron]

Robert,

This change patches ReaderWriterOSGA.cpp so that it passes along the
ReaderWriter::Options to files loaded from inside the archive. Previously it
was discarding them.

example:
osgviewer -O noLoadExternalReferenceFiles archive.osga

The above option (for IVE format) was not being applied to IVE's found
inside the archive.
Thanks - Glenn

-- 
Glenn Waldron : Pelican Mapping : http://pelicanmapping.com : 703-652-4791
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