change_folder(a_folder)

Make a new PathInfo changing the folder.

The path form for a parameter must keep consistency with a path passed to the constructor method. If the target was constucted by make_with_posix. The path form must be POSIX. If the target was constructed by make_with_hfs, the path form must be HFS.

• a_folder (alias, furl, POSIX path or HFS path) : A reference to a folder

script object : A new instance of PathInfo