NEW: add calibration

Change-Id: I03e5489a67042e7f76f5a42260a289d540b5a63a
(cherry picked from commit cbac2c639db830eb779b1979c8d6b4eb3decb7e6)

src/libslic3r/GCode.hpp

@@ -413,6 +413,7 @@ private:
        methods. */
     Vec2d                               m_origin;
     FullPrintConfig                     m_config;
+    DynamicConfig                       m_calib_config;
     // scaled G-code resolution
     double                              m_scaled_resolution;
     GCodeWriter                         m_writer;