Revision 2326

Move the import AnnotationLayer to the function where it is needed, because it don't works if it stands at the beginning.
(MF_Layer.__init__): Removed the extra numclassed variable. Now numclasses from the mapscript will be used.
(MF_Layer.get_index): New. Return the index of the layer in mapfile.
(MF_Layer.set_classes): New. A Classlist will be set to the layer.
(MF_Layer.set_metadata): New. A Metadata mapscript object will set.
(MF_Layer.remove_allclasses): New. All class of the layer will remove.
(MF_Map.create_new_layer): New. A new Layer is created and associated with the mapscript object.
(MF_Map.set_layerorder): New. The Layer order like in thuban is set in the mapscript.
(MF_Map.add_thubanlayer): Now a new layerobj is created if no one is linked to the layer in thuban, else the layerobject linked to the thubanlayer will be used.
AnnotationLayer will now store the filename of the shapefile.
(MF_Map.remove_layer): If a layer is removed the associated object must be set new.