[GRASS-dev] include/vect/dig_externs.h: Extra prototypes

[Ivan Shmakov]

	The following functions are declared in
	include/vect/dig_externs.h (as of a recent SVN checkout), yet
	there're no trace of their definitions in the source.

dig__check_dist
dig_check_dist
dig_get_cont_lines
dig_get_next_cont_line
dig_head_to_map
dig_map_to_head
dig_point_by_line
dig_point_to_area
dig_point_to_line
dig_point_to_next_area

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