Converted the instances of const built in types being returned from methods

and passed as paramters into straight forward non const built in types,
i.e. const bool foogbar(const int) becomes bool foobar(int).

include/osg/AnimationPath

@@ -45,7 +45,7 @@ class SG_EXPORT AnimationPath : public osg::Referenced
             osg::Quat _rotation;
             osg::Vec3 _scale;
             
-            inline void interpolate(const float ratio,const ControlPoint& first, const ControlPoint& second)
+            inline void interpolate(float ratio,const ControlPoint& first, const ControlPoint& second)
             {
                 float one_minus_ratio = 1.0f-ratio;
                 _position = first._position*one_minus_ratio + second._position*ratio;