A big change in PiecePoly

There is a big change in PiecePoly ,a new algorithm shorten greatly creating time.In test ,with the same scene, it takes around 32 seconds to complete piecing in previous version,but only need 5 ~6 seconds in the new version.And the parameters were decreased , this make UI more clear and easier to understand. For more details ,please refer to the page:http://www.flyingcfx.com/help/index.php?tool_id=55