More refactor file manipulations to use pathlib

Author: marcharper

src/axelrod_fortran/shared_library_manager.py

@@ -64,7 +64,7 @@ def create_library_copy(self):
             self.prefix,
             str(copy_number),
             self.shared_library_name)
-        new_filename = str(Path(temp_directory) / filename)
+        new_filename = str(Path(temp_directory, filename))
         if self.verbose:
             print("Loading {}".format(new_filename))
         shutil.copy2(self.library_path, new_filename)
@@ -110,7 +110,7 @@ def __del__(self):
             if path.exists():
                 if self.verbose:
                     print("deleting", str(path))
-                os.remove(str(path))
+                path.unlink()
 
 
 # Setup up thread safe library manager.