bugfixes

Today some important bugfixes made it into the SVN-version.
They both affect the LOD-DataSet and it's rendering.
The first one was a typo that made the LOD1 and LOD2 save the unsimplified ways instead of the simplified ones. (Still less information then LOD0 sine not all types of ways are saved)
The second was a bug we have been looking into for some time deep in the TileCalculator. It now correctly selects the tiles that are within some given bounds on LOD1 and LOD2-levels.