[osg-submissions] Add osgDB::Options to write*File() interface

[Paul Martz]

Hi Robert -- Per our conversation, here's the osgDB::Registry changes to add
Options to the read*File() interface. As we discussed, this preserves the
old interface for backwards compatibility. 
 
osgconv also changed to use the new Registry::writeNode() interface. No
other applications or examples were affected.
 
Thanks,
 
Paul Martz
Skew Matrix Software LLC
http://www.skew-matrix.com <http://www.skew-matrix.com/> 
303 859 9466
 
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