Added new style for displaying housenumbers & sped up generation of GetCapabilties document

[andreassteffens]

• A new style has been added that adds house numbers and place names to the map in zoom levels 17 and 18.
• Projection and extent information have been added to the symbol layer template mapfiles in order to speed up generation of the GetCapabilities document. Without these information Mapserver will traverse the entire database tables in order to determine the layer bounds.
• A homogeneous indentation hase been applied to all layer template mapfiles improving readability of the resulting complete mapfile.