Align
Support "/" as the path delimiter.

There are two motivations.

 1. If we use "\" (backslash) in the fainstall.ini (Shift_JIS encoded)
    it can be replaced to "yen mark" unexpectedly by the text editor.
    "/" seems safe from such unexpected modifications.
 2. "/" is the standard delimiter on Linux and other environments.
    We sometimes confuse which delimiter should be used.
    If both delimiters are accepted, we can be unthoughtful around
    such thing.