noer::point should behave as boost::numeric::ublas::vector

[agate-pris]

noer::point is wrapper class for boost::numeric::ublas::vector to adapt Boost.Geometry.
It contains vector as member variable.

noer::point may inherit vector because it enable to behave as vector . In many cases, it is very userful.

For example, operator() , operator[] is nice and operator += can apply to returned value of it. boost::geometry::get and set is generic but verbose when simply return member variable.

Carefully make constructors.