updated after commit
64ee58ed46d371553bb315a0f693fc9ea3737099
(Fix calculation of the number of points in round buffer)
New areas are changed max 0.2% w.r.t. old areas, and are in general
closer to what PostGIS gives
This gains in some cases more than 10% performance
This gives two small changes in expected areas for country buffer deflate-5, which are not
visible and not detectable using other tools (spent quite some time to try)
