Used only for the Dynamic Draw.
	Enumerate type for edges of a terminal line.
	
	    Current heading
	      ---------->
	
	                      o 2
	                     / \
	                    /   \
	                 1 /     \ 3
	       - - - - - -o-------o- - - - - -
	                   \     /
	                    \   /
	                     \ /
	                      o 4
	
	The completator of map subnet of edge of a terminal line may update
        the map subnet according these values:
	ONLY_SINK_OR_SOURCE_DIAGONALS                         = 1   only the edges 1-2 and 1-4
	ONLY_SINK_OR_SOURCE_DIAGONALS_FOR_EAGLE_BOUNDARY_EDGE = 2   only the edges 1-2 and 1-4, but on a eagle boundary edge
	WALK_ALONG_AND_SINK_OR_SOURCE_DIAGONALS               = 3   the straigth edge 1-3 and the edges 1-2 and 1-4
	
	For these edges, the direction is choosen according the value
	of "DD_terminal_node_type" of the node starting the terminal line.
	



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