Introduced CMake build option for compiling double or float versions of osg::BoundingSphere and osg::BoundingBox.

Introduced code in BoundgingSphere, BoundingBox, ProxyNode and LOD to utilise the above settings.

Added Matrix::value_type, Plane::value_type, BoundingSphere::value_type and BoundingBox::value_type command line 
options that report where the types of floats or doubles.

include/osg/Vec4d

@@ -248,12 +248,37 @@ inline Vec4d::value_type operator * (const Vec3d& lhs,const Vec4d& rhs)
     return lhs[0]*rhs[0]+lhs[1]*rhs[1]+lhs[2]*rhs[2]+rhs[3];
 }
 
+/** Compute the dot product of a (Vec3,1.0) and a Vec4d. */
+inline Vec4d::value_type operator * (const Vec3f& lhs,const Vec4d& rhs)
+{
+    return lhs[0]*rhs[0]+lhs[1]*rhs[1]+lhs[2]*rhs[2]+rhs[3];
+}
+
+/** Compute the dot product of a (Vec3,1.0) and a Vec4d. */
+inline Vec4d::value_type operator * (const Vec3d& lhs,const Vec4f& rhs)
+{
+    return lhs[0]*rhs[0]+lhs[1]*rhs[1]+lhs[2]*rhs[2]+rhs[3];
+}
+
+
 /** Compute the dot product of a Vec4d and a (Vec3,1.0). */
 inline Vec4d::value_type operator * (const Vec4d& lhs,const Vec3d& rhs)
 {
     return lhs[0]*rhs[0]+lhs[1]*rhs[1]+lhs[2]*rhs[2]+lhs[3];
 }
 
+/** Compute the dot product of a Vec4d and a (Vec3,1.0). */
+inline Vec4d::value_type operator * (const Vec4d& lhs,const Vec3f& rhs)
+{
+    return lhs[0]*rhs[0]+lhs[1]*rhs[1]+lhs[2]*rhs[2]+lhs[3];
+}
+
+/** Compute the dot product of a Vec4d and a (Vec3,1.0). */
+inline Vec4d::value_type operator * (const Vec4f& lhs,const Vec3d& rhs)
+{
+    return lhs[0]*rhs[0]+lhs[1]*rhs[1]+lhs[2]*rhs[2]+lhs[3];
+}
+
 }    // end of namespace osg
 
 #endif