Removed the Point::wkt() and Point::dump_perl() methods.

Added to_string() for the basis Eigen vector types.

xs/src/libslic3r/Polyline.hpp

@@ -73,7 +73,6 @@ public:
     template <class T> void simplify_by_visibility(const T &area);
     void split_at(const Point &point, Polyline* p1, Polyline* p2) const;
     bool is_straight() const;
-    std::string wkt() const;
 };
 
 extern BoundingBox get_extents(const Polyline &polyline);