[mkgmap-dev] [PATCH v2] Move maxspeed calculations to style file

The patch moves the road speed calculations based on the maxspeed tag to the style file. It uses the new maxspeedkmh function to calculate the new internal tag mkgmap:road-speed-class. This makes the ignore-maxspeeds option superfluous. Anyhow I have kept it to ignore the evaluation of the new tag mkgmap:road-speed-class. The second advantage is that maxspeed can be removed from the builtin-tag-list which meaans the maxspeed tag is not loaded if not referenced in the style file. WanMil