Rename coordinate_systems -> csys

Author: ahojukka5

…lude/openpfc/core/coordinate_systems.hpp include/openpfc/core/csys.hppinclude/openpfc/core/coordinate_systems.hpp renamed to include/openpfc/core/csys.hpp include/openpfc/core/coordinate_systems.hpp renamed to include/openpfc/core/csys.hpp

@@ -120,7 +120,7 @@
 #include <ostream>
 #include <stdexcept>
 
-#include "coordinate_systems.hpp"
+#include "csys.hpp"
 #include "types.hpp"
 
 namespace pfc {