serveral improvements to SVN-version

* Fixed 3 important bugs in Bounds
* Debugged Polygon-Simplification in WayHelper
* Added LevelOfDetail-DataSet
* Added DebugLog-Frame and made PlaceFinder asynchronous
* Improved Renderers to use LODDataSet

Witht the LODDataSet we can now render maps
of low zoom-levels (multiple cities visible)
offline. It still needs tuning and a second
LOD-step.