[osg-submissions] Add slave camera

[Robert Osfield]

Hi Filip,

I've been wondering about the issue with binary compatibility - and
adding a virtual function breaks binary compatibility which is bad
news for 2.2.1.  It occurred to me that the only way not to break
binary compatibility would be to modify the existing View::addSlave
method so that it copied it's Camera's subgraph from the master
Camera's subgraph.

I have modified and checked in the modified View.cpp, its also
attached.  I didn't have any example code to reproduce the original so
could you try at your end?

Cheers,
Robert.
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