title: boost::polygon and boost/geometry/geometries/polygon difference?
body: <p>I have two questions: </p>
  
  <p>1.) i^ve just found the boost 1.53 Polygon implementation (on <a href="http://www.boost.org/doc/libs/1_53_0/libs/polygon" rel="nofollow">http://www.boost.org/doc/libs/1_53_0/libs/polygon</a>) and would like to test it, because the features are amazing for CAD programmers like me. 
  (But i dont get the stuff with the template reinitialization "<a href="http://www.boost.org/doc/libs/1_53_0/libs/polygon/doc/voronoi_basic_tutorial.htm" rel="nofollow">http://www.boost.org/doc/libs/1_53_0/libs/polygon/doc/voronoi_basic_tutorial.htm</a>")
  Does anybody knows a good tutorial which explains why this template reinitialization is needed and how to do it right. Or how to get along without it.</p>
  
  <p>2.) At looking for Tutorials i found a lot of web sites working with #include "boost/geometry/geometries/polygon..." 
  Is this the same as #include "boost/polygon..."
  Or does boost uses two implementations of the same thing (polygon)?
  Or is it just a Versioning thing?</p>
  
  <p>Thanks to anyone who can help me to clear this.
  Regards</p>