[osg-submissions] Document that Matrix::getRotate assumes non-scaled matrices

[Paul Martz]

Hi Robert -- Per the discussion in osg-users, this change adds code comments
to the Matrix* headers to document assumptions in the getRotate() method.
 
Paul Martz
Skew Matrix Software LLC
http://www.skew-matrix.com <http://www.skew-matrix.com/> 
303 859 9466
 
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