New calling conventions, start on print.cpp

luprex/core/cpp/planemap.hpp

@@ -128,7 +128,7 @@ public:
     
 private:
     // unit testing stuff.
-    friend int unittests_planemap(lua_State *L);
+    friend int lfn_unittests_planemap(lua_State *L);
     EltVec get_cell(const std::string &plane, int64_t cell) const;
     int total_cells() const;
     void clear() { planes_.clear(); }