bool hit_test(double x, double y, double tol);
2. added image_view(unsigned x, unsigned y, unsigned width, unsigned height)
allowing to select region from image data e.g (in Python):
im = Image(2048,2048)
view = im.view(0,0,256,256)
save_to_file(filename,type, view)
3. changed envelope method to return vy value in datasource classes
4. features_at_point impl for shape and postgis plug-ins
2. use boost::thread for mutex/lock
3 use boost::noncopyable
4 build agg as a shared lib for now
5. corrected panning code in map.cpp
6. improved coord_transform
