[osg-submissions] osg/Notify.cpp: add level prefix to messages for easy sorting/culling of messages

[Bob Kuehne]

the attached change does two things to the osg notification code:

1) cleans up the logic involved in returning the ostream in  
osg::notify()
2) adds a prefix to osg::notify() to print the level of the message,  
along
    with whatever user output follows

change 2 depends upon change 1.

bob
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